Supercharged

CSS variables.

v1.7.7 MIT

        @import "https://unpkg.com/open-props";
        

          .card {
            border-radius: var(--radius-2);
            padding: var(--size-fluid-3);
            box-shadow: var(--shadow-2);

            &:hover {
              box-shadow: var(--shadow-3);
            }

            @media (--motionOK) {
              animation: var(--animation-fade-in);
            }
          }
        

Why Use Open Props?

It's non-prescriptive.

Design Consistently
Incidentally harmonious.
Predictable
Thanks to consistent naming conventions.
Incrementally Adoptable
Grab all the props, props as JS, or only what you need.
Customizable
Map the props from JS or customize builds from the command line.

Overview

File sizes and links to source:

File Sizes

The following sizes are for the minified files and after Brotli compression.

Library bundles
4.0kB
open-props.min.css
500+ props
Extras
1.3kB
0.81kB
Individual PropPacks ™
0.49kB
0.1kB
0.25kB
1.3kB
1.2kB
1.4kB
0.2kB
0.4kB
1.0kB
0.62kB
0.23kB
0.38kB
0.26kB
0.2kB
0.1kB
0.05kB
0.30kB
Coming Soon?!
??
icons.css WIP
??
svg.css WIP
??
patterns.css WIP
??
at-property.css WIP
??
shapes.css WIP
??
layouts.css WIP
??
clips.css WIP
??
variable-fonts.css WIP
??
lists.css WIP
??
counters.css WIP
??
utilities.css WIP

This site
is built
with Open Props.


          @import "https://unpkg.com/open-props";
        

          .just-for-gap {
            display: grid;
            gap: var(--size-4);
          }
        

          blockquote {
            --_accent-1: var(--lime-5);
            --_accent-2: var(--lime-4);
            --_bg: var(--surface-2);
            --_ink: var(--text-1);

            color: var(--_ink);
            border-color: var(--_accent-2);
            background-color: var(--_bg);
            justify-self: flex-start;
          }
        

          .gradient-swatch {
            border-radius: var(--radius-2);
            aspect-ratio: var(--ratio-landscape);
          }
        

          pre > code {
            box-shadow: var(--shadow-6);
            font-family: var(--font-mono);
            font-size: var(--font-size-2);
          }
        

          .yellow-badge {
            padding-inline: var(--size-1);
            border-width: var(--border-size-1);
            border-color: var(--yellow-6);
            color: var(--yellow-2);
            border-radius: var(--radius-round);

            @nest [data-theme="light"] & {
              border-color: var(--orange-2);
              color: var(--orange-6);
            }
          }
        

          .block-wrap {
            display: flex;
            flex-wrap: wrap;
            flex-basis: var(--size-content-2);
            gap: var(--size-5) var(--size-8);
            align-items: flex-start;
          }
        

          .demo-gallery figure {
            border-radius: var(--radius-3);
            box-shadow: var(--shadow-4);
          }
        

          .op-icon-p {
            stroke: var(--indigo-2);
            @nest a:hover & { stroke: var(--indigo-1); }

            @nest [data-theme="light"] & {
              stroke: var(--indigo-9);
              @nest a:hover & { stroke: var(--indigo-8); }
            }
          }
        

          .checkmark-list {
            align-self: flex-start;
            display: grid;
            gap: var(--size-2);
            font-size: var(--font-size-fluid-1);
            font-weight: var(--font-weight-2);
            padding-inline-start: 0;
          }
        

Getting Started

These props come in many flavors: CSS, PostCSS, JSON, or Javascript. Get em from a CDN or NPM. Try it in browser with Preact, Vite, Vanilla Extract, Lit, Qwik, you name it, it's in this helpful Stackblitz collection

Need help?
Ask a question on Discord

Learn with Jason & Adam

CDN

No installation required.

View all ↗

CSS
index.css

                  /* the props */
                  @import "https://unpkg.com/open-props";

                  /* optional imports that use the props */
                  @import "https://unpkg.com/open-props/normalize.min.css";
                  @import "https://unpkg.com/open-props/buttons.min.css";

                  /* just dark or light themes */
                  @import "https://unpkg.com/open-props/normalize.dark.min.css";
                  @import "https://unpkg.com/open-props/buttons.dark.min.css";
                  @import "https://unpkg.com/open-props/normalize.light.min.css";
                  @import "https://unpkg.com/open-props/buttons.light.min.css";

                  /* individual imports */
                  @import "https://unpkg.com/open-props/indigo.min.css";
                  @import "https://unpkg.com/open-props/indigo-hsl.min.css";
                  @import "https://unpkg.com/open-props/easings.min.css";
                  @import "https://unpkg.com/open-props/animations.min.css";
                  @import "https://unpkg.com/open-props/sizes.min.css";
                  @import "https://unpkg.com/open-props/gradients.min.css";
                  /* see PropPacks for the full list */
                
index.html

                  <!-- the props -->
                  <link rel="stylesheet" href="https://unpkg.com/open-props"/>

                  <!-- optional imports that use the props -->
                  <link rel="stylesheet" href="https://unpkg.com/open-props/normalize.min.css"/>
                  <link rel="stylesheet" href="https://unpkg.com/open-props/buttons.min.css"/>

                  <!-- individual imports -->
                  <link rel="stylesheet" href="https://unpkg.com/open-props/indigo.min.css"/>
                  <link rel="stylesheet" href="https://unpkg.com/open-props/indigo-hsl.min.css"/>
                  <link rel="stylesheet" href="https://unpkg.com/open-props/easings.min.css"/>
                  <link rel="stylesheet" href="https://unpkg.com/open-props/animations.min.css"/>
                  <link rel="stylesheet" href="https://unpkg.com/open-props/sizes.min.css"/>
                  <link rel="stylesheet" href="https://unpkg.com/open-props/gradients.min.css"/>
                  <!-- see PropPacks for the full list -->
                
index.js

                  // the props
                  import 'https://unpkg.com/open-props';

                  // optional imports that use the props
                  import 'https://unpkg.com/open-props/normalize.min.css';
                  import 'https://unpkg.com/open-props/buttons.min.css';

                  // just go dark themed or light themed
                  import 'https://unpkg.com/open-props/normalize.dark.min.css';
                  import 'https://unpkg.com/open-props/buttons.dark.min.css';
                  import 'https://unpkg.com/open-props/normalize.light.min.css';
                  import 'https://unpkg.com/open-props/buttons.light.min.css';

                  // individual imports
                  import 'https://unpkg.com/open-props/indigo.min.css';
                  import 'https://unpkg.com/open-props/indigo-hsl.min.css';
                  import 'https://unpkg.com/open-props/easings.min.css';
                  import 'https://unpkg.com/open-props/animations.min.css';
                  import 'https://unpkg.com/open-props/sizes.min.css';
                  import 'https://unpkg.com/open-props/gradients.min.css';
                  // see PropPacks for the full list
                
PostCSS
CSS import examples

                  /* the props */
                  @import "https://unpkg.com/open-props/src/index.css";

                  /* optional imports that use the props */
                  @import "https://unpkg.com/open-props/src/extra/normalize.css";
                  @import "https://unpkg.com/open-props/src/extra/buttons.css";

                  /* individual imports */
                  @import "https://unpkg.com/open-props/src/indigo.min.css";
                  @import "https://unpkg.com/open-props/src/indigo-hsl.min.css";
                  @import "https://unpkg.com/open-props/src/easings.min.css";
                  @import "https://unpkg.com/open-props/src/animations.min.css";
                  @import "https://unpkg.com/open-props/src/sizes.min.css";
                  @import "https://unpkg.com/open-props/src/gradients.min.css";
                  /* see PropPacks for the full list */
                
Design Tokens

Not all props can be represented as a design token.

JSON

Follows the (draft) Design Tokens Spec


                    https://unpkg.com/open-props/open-props.tokens.json
                    
Figma Tokens

Community created setup instructions.


                    https://unpkg.com/open-props/open-props.figma-tokens.json
                    https://unpkg.com/open-props/open-props.figma-tokens.sync.json
                    
Style Dictionary

Tokens

                    import "open-props/style-dictionary-tokens"
                    // or
                    import "open-props/open-props.style-dictionary-tokens.json"
                    

                    https://unpkg.com/open-props/open-props.style-dictionary-tokens.json
                    
Web Components
NPM import examples

                  /* the props */
                  @import "open-props/shadow/style";
                  @import "open-props/open-props.shadow.min.css";

                  /* individual imports */
                  @import "open-props/shadow/indigo";
                  @import "open-props/shadow/indigo-hsl";
                  @import "open-props/shadow/easings";
                  @import "open-props/shadow/animations";
                  @import "open-props/shadow/sizes";
                  @import "open-props/shadow/gradients";
                  /* see PropPacks for the full list */
                
CDN import examples

These props are scoped to :host for use in shadow DOM.


                  /* the props */
                  @import "https://unpkg.com/open-props/open-props.shadow.min.css";

                  /* individual imports */
                  @import "https://unpkg.com/open-props/indigo.shadow.min.css";
                  @import "https://unpkg.com/open-props/indigo.shadow-hsl.min.css";
                  @import "https://unpkg.com/open-props/easings.shadow.min.css";
                  @import "https://unpkg.com/open-props/animations.shadow.min.css";
                  @import "https://unpkg.com/open-props/sizes.shadow.min.css";
                  @import "https://unpkg.com/open-props/gradients.shadow.min.css";
                  /* see PropPacks for the full list */
                

NPM

npm install open-props
CSS
CSS Imports

                    /* the props */
                    @import "open-props/style";

                    /* optional imports that use the props */
                    @import "open-props/normalize";
                    @import "open-props/buttons";

                    /* just light or dark themes */
                    @import "open-props/normalize/dark";
                    @import "open-props/buttons/dark";
                    @import "open-props/normalize/light";
                    @import "open-props/buttons/light";

                    /* individual imports */
                    @import "open-props/indigo";
                    @import "open-props/easings";
                    @import "open-props/animations";
                    @import "open-props/sizes";
                    @import "open-props/gradients";
                    /* see PropPacks for the full list */
                  
Full Path Imports

                    /* the props */
                    @import "open-props/open-props.min.css";

                    /* optional imports that use the props */
                    @import "open-props/normalize.min.css";
                    @import "open-props/buttons.min.css";

                    /* individual imports */
                    @import "open-props/indigo.min.css";
                    @import "open-props/easings.min.css";
                    @import "open-props/animations.min.css";
                    @import "open-props/sizes.min.css";
                    @import "open-props/gradients.min.css";
                    /* see PropPacks for the full list */
                  
PostCSS
CSS Imports

                  /* the props */
                  @import "open-props/postcss/style";

                  /* optional imports that use the props */
                  @import "open-props/postcss/normalize";
                  @import "open-props/postcss/buttons";

                  /* individual imports */
                  @import "open-props/postcss/indigo";
                  @import "open-props/postcss/easings";
                  @import "open-props/postcss/animations";
                  @import "open-props/postcss/sizes";
                  @import "open-props/postcss/gradients";
                  /* see PropPacks for the full list */
                
Full Path CSS Imports

                  /* the props */
                  @import "open-props/postcss/index.css";

                  /* optional imports that use the props */
                  @import "open-props/postcss/extra/normalize.css";
                  @import "open-props/postcss/extra/buttons.css";

                  /* individual imports */
                  @import "open-props/postcss/indigo.min.css";
                  @import "open-props/postcss/easings.min.css";
                  @import "open-props/postcss/animations.min.css";
                  @import "open-props/postcss/sizes.min.css";
                  @import "open-props/postcss/gradients.min.css";
                  /* see PropPacks for the full list */
                
JavaScript
Bundles

                    // index.js loading JS object
                    import OpenProps from 'open-props'; // module
                    import OpenProps from 'open-props/src'; // unbundled ES module
                    import Colors from 'open-props/src/colors';

                    // object notation access is special to OpenProps
                    console.info(OpenProps.size1);
                    console.info(OpenProps['--size-1']);

                    console.info(Colors['--indigo-5']);
                  
Individual imports

                    // import just 1 color set object
                    import {Indigo} from 'open-props/src/colors';

                    // import shadows without prop deps
                    import {StaticShadows} from 'open-props/src/shadows';

                    // import the gradients
                    import Gradients from 'open-props/src/gradients';
                    // see PropPacks for the full list
                  
Design Tokens

                  /* 3 ways to import */
                  import 'open-props/tokens'
                  import 'open-props/json'
                  import 'open-props/design-tokens'
                  
PostCSS JIT Props

Only ship the props you use. Learn more.

PostCSS
npm install postcss-jit-props

Stop importing Open Props in your CSS (if you were).

This plugin adds them to your stylesheet as you use them 🙂

Props as Javascript

                    // postcss.config.js
                    const postcssJitProps = require('postcss-jit-props');
                    const OpenProps = require('open-props');

                    module.exports = {
                      plugins: [
                        postcssJitProps(OpenProps),
                      ]
                    }
                  
Props from CSS

                    // postcss.config.js
                    const postcssJitProps = require('postcss-jit-props');
                    const path = require('path');

                    module.exports = {
                      plugins: [
                        postcssJitProps({
                          files: [
                            path.resolve(__dirname, 'node_modules/open-props/open-props.min.css'),
                          ]
                        }),
                      ]
                    }
                  

CLI

git clone https://github.com/argyleink/open-props.git
Customize your build
Customize Bundles


                    // build src files
                    npm run gen:shadowdom                   // src files with `:host` instead of `html`
                    npm run gen:nowhere                     // src files without `:where()`
                    npm run gen:prefixed                    // each prop prefixed with `op`, like `--op-font-size-1`

                    // full custom! pass args with node to the props.js script
                    node props.js 'ns' true ':root' 'my'
                    ⇣
                    // arg1: default '', is a custom namespace, props will be --ns-gray-1
                    // arg2: default false, indicates wrapping in :where() or not
                    // arg3: default '', set a custom selector like :scope, .my-class, etc
                    // arg4: default '', set a file prefix, files will be my.props.easing.css, etc
                  
Build Locally

                    npm run gen:op          // runs through `src/` js files and creates the PostCSS files in `src/`
                    npm run gen:shadowdom   // runs through `src/` js files and creates the PostCSS files in `src/`
                    npm run build           // does both gen:op and gen:shadowdom
                    npm run bundle          // creates all the various minified bundles of props
                    npm run lib:js          // builds the JS modules for NPM
                  

Autocomplete

VScode
  1. VScode has an intellisense feature which you can tap into, by passing the path to the node_modules folder where open-props is installed
  2. In your VScode environment, navigate to the extensions marketplace, and install this CSS Var Complete extension
  3. When the extension is installed, you'll have to add open-prop's css file path to a .vscode/settings.jsonfile. Take a look at an illustration below
  4. 
                    // .vscode/settings.json file
                    {
                      "cssvar.files": [
                        "./node_modules/open-props/open-props.min.css",
                        // if you have an alternative path to where your styles are located
                        // you can add it in this array of files
                        "assets/styles/variables.css"
                      ],
    
                      // Do not ignore node_modules css files, which is ignored by default
                      "cssvar.ignore": [],
    
                      // add support for autocomplete in JS or JS like files
                      "cssvar.extensions": [
                        "css", "postcss", "jsx", "tsx"
                      ]
                    }
                  
  5. Check details on settings and it's defaults  in the repo
Sublime Text
  1. There are number of ways with which the autocomplete engine of Sublime Text can be extended. You can decide to use the completion files, snippets or plugins.
  2. An approach that is less strenuous is the "completion file" approach. Here, all you'd be required to do is point the `scope` keyword in the .sublime-completions file to the open-props classes in the node_modules folder like so:
  3. 
                    // .sublime-completions file
                    {
                      "scope": "./node_modules/open-props/open-props.min.css",
                      "completions": [
                        // here you'll add the classes you want autocomplete for.
                      ]
                  }
                  
  4. You can also add an alternative path to your variables, if you have one — in the completions file, like so:
  5. 
                    // .sublime-completions file
                    {
                      "scope": "path/to/your/variables",
                  }
                  
  6. Another approach for enabling autocomplete would be to open the settings json file of Sublime Text via Preferences > Settings, then you'll modify the file to include the snippet below — replacing "source" with the path to your variables.
  7. 
                    "auto-complete-selector": "source, text"
                  
  8. You can learn more about the completion process in Sublime Text here.

Colors

Open Props includes Open Color, an open-source color scheme optimized for UI development, and its extension, Colar.

Open the color picker in your browser dev tools, set the swatches to the page's custom properties, and enjoy picking from the set!
The Props

              --gray-{0-12}
              --stone-{0-12}
              --red-{0-12}
              --pink-{0-12}
              --purple-{0-12}
              --violet-{0-12}
              --indigo-{0-12}
              --blue-{0-12}
              --cyan-{0-12}
              --teal-{0-12}
              --green-{0-12}
              --lime-{0-12}
              --yellow-{0-12}
              --orange-{0-12}
              --choco-{0-12}
              --brown-{0-12}
              --sand-{0-12}
              --camo-{0-12}
              --jungle-{0-12}
            
Button Sample

            button.blue {
              color: var(--blue-6);
              background-color: var(--blue-0);
              border: 1px solid var(--blue-1);
              text-shadow: 0 1px 0 var(--blue-2);

              &:hover {
                background-color: var(--blue-1);
              }
            }
          
Light & Dark Example

            html {
              --text-1: var(--gray-9);
              --text-2: var(--gray-7);

              @media (--OSdark) {
                --text-1: var(--gray-1);
                --text-2: var(--gray-2);
              }
            }
          
Modify Opacity Example

            /* additional import required */
            /* @import "open-props/gray-hsl"; */
            @import "open-props/colors-hsl";

            .backdrop {
              background-color: hsl(var(--gray-9-hsl) / 30%);
            }
          

Copy type

Copy format

Brand Colors

Various brand colors.

Not part of the main bundle. Must be individually imported.
NPM Imported Usage Sample
@import "open-props/brand-colors";

.facebook-logo {
  fill: var(--brand-facebook);
}
Color Theming 101

1) Color theming

Low numbers are light and high numbers are dark. See how the Open Props normalize.css implements light and dark modes.

See it live: auto, light, dark, dim and purple themes demonstrated with Open Props!

Light

                html {
                  --brand-light: var(--orange-6);

                  --text-1-light: var(--gray-8);
                  --text-2-light: var(--gray-7);

                  --surface-1-light: var(--gray-0);
                  --surface-2-light: var(--gray-1);
                  --surface-3-light: var(--gray-2);
                  --surface-4-light: var(--gray-3);
                }
              
Dark

                html {
                  --brand-dark: var(--orange-3);

                  --text-1-dark: var(--gray-3);
                  --text-2-dark: var(--gray-5);

                  --surface-1-dark: var(--gray-12);
                  --surface-2-dark: var(--gray-11);
                  --surface-3-dark: var(--gray-10);
                  --surface-4-dark: var(--gray-9);
                }
              
Dim

                html {
                  --brand-dim: var(--orange-4);

                  --text-1-dim: var(--gray-3);
                  --text-2-dim: var(--gray-4);

                  --surface-1-dim: var(--gray-8);
                  --surface-2-dim: var(--gray-7);
                  --surface-3-dim: var(--gray-6);
                  --surface-4-dim: var(--gray-5);
                }
              
Purple

                html {
                  --brand-purple: var(--purple-5);

                  --text-1-purple: var(--purple-9);
                  --text-2-purple: var(--purple-7);

                  --surface-1-purple: var(--purple-0);
                  --surface-2-purple: var(--purple-1);
                  --surface-3-purple: var(--purple-2);
                  --surface-4-purple: var(--purple-3);
                }
              

2) Creating adaptive color schemes

It's not ideal for components to reference individual light or dark theme colors. Instead, you should prefer to use these individual variables to build a set of theme-agnostic aliases. This allows you to reference a custom property without worrying about its underlying value, which will dynamically adapt to the current context's theme.

No Preference (Light)

                :root {
                  --brand: var(--brand-light);

                  --text-1: var(--text-1-light);
                  --text-2: var(--text-2-light);

                  --surface-1: var(--surface-1-light);
                  --surface-2: var(--surface-2-light);
                  --surface-3: var(--surface-3-light);
                  --surface-4: var(--surface-4-light);
                }
              
Prefers Dark

                @media (prefers-color-scheme: dark) {
                  :root {
                    --brand: var(--brand-dark);

                    --text-1: var(--text-1-dark);
                    --text-2: var(--text-2-dark);

                    --surface-1: var(--surface-1-dark);
                    --surface-2: var(--surface-2-dark);
                    --surface-3: var(--surface-3-dark);
                    --surface-4: var(--surface-4-dark);
                  }
                }
              
Prefers Dim

                @media (prefers-contrast: less) {
                  :root {
                    --brand: var(--brand-dim);

                    --text-1: var(--text-1-dim);
                    --text-2: var(--text-2-dim);

                    --surface-1: var(--surface-1-dim);
                    --surface-2: var(--surface-2-dim);
                    --surface-3: var(--surface-3-dim);
                    --surface-4: var(--surface-4-dim);
                  }
                }
              
Prefers Purple

                [color-scheme="purple"] {
                  --brand: var(--brand-purple);

                  --text-1: var(--text-1-purple);
                  --text-2: var(--text-2-purple);

                  --surface-1: var(--surface-1-purple);
                  --surface-2: var(--surface-2-purple);
                  --surface-3: var(--surface-3-purple);
                  --surface-4: var(--surface-4-purple);
                }
              

3) Using the aliases

Your app is now free to use adaptive custom properties! Now, your team only needs to remember a single naming convention rather than wrestling with individual theming variables. Here are a few examples of how the above color theme system could be used.

Page Styles Using Themes

                html {
                  background-color: var(--surface-1);
                  color: var(--text-1);
                  accent-color: var(--link);
                }
              
Utilities

                .surface-1 {
                  background-color: var(--surface-1);
                  color: var(--text-2);
                }

                .surface-2 {
                  background-color: var(--surface-2);
                  color: var(--text-2);
                }

                .surface-3 {
                  background-color: var(--surface-3);
                  color: var(--text-1);
                }

                .surface-4 {
                  background-color: var(--surface-4);
                  color: var(--text-1);
                }
              
Typography

                h1,h2,h3,h4,p,dt {
                  color: var(--text-1);
                }

                h5,h6,small,dd {
                  color: var(--text-2);
                }
              

Gradients

Open Props includes 30 handcrafted gradients. Linear gradient direction can be changed with a custom property mixin.

Don't miss the noise props inspired by grainy-gradients.

The Props

              --gradient-{1-30}
            
Hero Header Sample

            header {
              background-image: var(--gradient-5);

              @media (--OSdark) {
                background-image: var(--gradient-15);
              }
            }
          
Gradient Text Sample

            .gradient-text {
              background: var(--gradient-1);
              -webkit-background-clip: text;
              -webkit-text-fill-color: transparent;
            }
          

Gradients

Noise


                --noise-{1-5}
                --noise-filter-{1-5}
              

              .noise-noise-noise {
                /* stack grain with a gradient */
                background-image: var(--gradient-3), var(--noise-3);
                /* force colors and noise to collide */
                filter: var(--noise-filter-3);
                /* fit noise image to element */
                background-size: cover;
              }
            

Noisy Examples

Shadows

Inner and outer shadows that adapt to light and dark modes.

The Props

              --shadow-{1-6}
              --inner-shadow-{0-4}
            
Card Sample

            .card {
              box-shadow: var(--shadow-1);

              &:hover {
                box-shadow: var(--shadow-3);
              }
            }
          

Aspect Ratios

Vars Sample

              --ratio-square: 1;
              --ratio-landscape: 4/3;
              --ratio-portrait: 3/4;
              --ratio-widescreen: 16/9;
              --ratio-ultrawide: 18/5;
              --ratio-golden: 1.6180/1;
            
Usage Sample

            .video-thumbnail {
              block-size: 480px;
              aspect-ratio: var(--ratio-widescreen);
            }
          
box
landscape
portrait
widescreen
golden ratio
ultrawide

Typography

Variable and static font sizes, smart line heights, modern font stacks, and other familiar typography variables, all ready to go.

The Props

              --font-size-{00-8}
              --font-size-fluid-{0-3}
              --font-weight-{1-9}
              --font-letterspacing-{0-7}
              --font-lineheight-{00-5}
              
            
Usage Sample

              .hero {
                line-height: var(--font-lineheight-1);
                font-size: var(--font-size-fluid-3);
                font-weight: var(--font-weight-9);
                font-family: var(--font-sans);
              }
          

Font Families

These rad font-families from Dan Klammer's modern font stacks provide great typefaces that are entirely local. With these font stacks you won't have to worry about slowing down your page load or layout shift from external fonts!


          --font-system-ui: system-ui, sans-serif;
          --font-transitional: Charter, Bitstream Charter, Sitka Text, Cambria, serif;
          --font-old-style: Iowan Old Style, Palatino Linotype, URW Palladio L, P052, serif;
          --font-humanist: Seravek, Gill Sans Nova, Ubuntu, Calibri, DejaVu Sans, source-sans-pro, sans-serif;
          --font-geometric-humanist: Avenir, Montserrat, Corbel, URW Gothic, source-sans-pro, sans-serif;
          --font-classical-humanist: Optima, Candara, Noto Sans, source-sans-pro, sans-serif;
          --font-neo-grotesque: Inter, Roboto, Helvetica Neue, Arial Nova, Nimbus Sans, Arial, sans-serif;
          --font-monospace-slab-serif: Nimbus Mono PS, Courier New, monospace;
          --font-monospace-code: Dank Mono, Operator Mono, Inconsolata, Fira Mono, ui-monospace, SF Mono,Monaco, Droid Sans Mono, Source Code Pro, Cascadia Code,Menlo, Consolas, DejaVu Sans Mono, monospace;
          --font-industrial: Bahnschrift, DIN Alternate, Franklin Gothic Medium, Nimbus Sans Narrow, sans-serif-condensed, sans-serif;
          --font-rounded-sans: ui-rounded, Hiragino Maru Gothic ProN, Quicksand, Comfortaa, Manjari, Arial Rounded MT, Arial Rounded MT Bold, Calibri, source-sans-pro, sans-serif;
          --font-slab-serif: Rockwell, Rockwell Nova, Roboto Slab, DejaVu Serif, Sitka Small, serif;
          --font-antique: Superclarendon, Bookman Old Style, URW Bookman, URW Bookman L, Georgia Pro, Georgia, serif;
          --font-didone: Didot, Bodoni MT, Noto Serif Display, URW Palladio L, P052, Sylfaen, serif;
          --font-handwritten: Segoe Print, Bradley Hand, Chilanka, TSCu_Comic, casual, cursive;
        
Unlike the other props, which are identical to their modern font stack counterparts, --font-monospace-code is modified in open-props.
--font-system-ui
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-transitional
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-old-style
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-humanist
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-geometric-humanist
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-classical-humanist
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-neo-grotesque
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-monospace-slab-serif
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-monospace-code
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-industrial
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-rounded-sans
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-slab-serif
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-antique
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-didone
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&
--font-handwritten
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890+=!@#%$%^&

Font Weights


              --font-weight-1: 100;
              --font-weight-2: 200;
              --font-weight-3: 300;
              --font-weight-4: 400;
              --font-weight-5: 500;
              --font-weight-6: 600;
              --font-weight-7: 700;
              --font-weight-8: 800;
              --font-weight-9: 900;
            
Aa

Letter Spacing


              --font-letterspacing-0: -.05em;
              --font-letterspacing-1: .025em;
              --font-letterspacing-2: .050em;
              --font-letterspacing-3: .075em;
              --font-letterspacing-4: .150em;
              --font-letterspacing-5: .500em;
              --font-letterspacing-6: .750em;
              --font-letterspacing-7: 1em;
            
Letter Spacing

Line Height


              --font-lineheight-00: .95;
              --font-lineheight-0: 1.1;
              --font-lineheight-1: 1.25;
              --font-lineheight-2: 1.375;
              --font-lineheight-3: 1.5;
              --font-lineheight-4: 1.75;
              --font-lineheight-5: 2;
            
Sample paragraph content to provide a preview for OP's line heights

Font Sizes


          --font-size-00: .5rem;
          --font-size-0: .75rem;
          --font-size-1: 1rem;
          --font-size-2: 1.1rem;
          --font-size-3: 1.25rem;
          --font-size-4: 1.5rem;
          --font-size-5: 2rem;
          --font-size-6: 2.5rem;
          --font-size-7: 3rem;
          --font-size-8: 3.5rem;
        
var(--font-size-00) Almost before you knew it, we'd touched ground. var(--font-size-0) Almost before you knew it, we'd touched ground. var(--font-size-1) Almost before you knew it, we'd touched ground. var(--font-size-2) Almost before you knew it, we'd touched ground. var(--font-size-3) Almost before you knew it, we'd touched ground. var(--font-size-4) Almost before you knew it, we'd touched ground. var(--font-size-5) Almost before you knew it, we'd touched ground. var(--font-size-6) Almost before you knew it, we'd touched ground. var(--font-size-7) Almost before you knew it, we'd touched ground. var(--font-size-8) Almost before you knew it, we'd touched ground.

Fluid Font Sizes


          --font-size-fluid-0: clamp(.75rem, 2vw, 1rem);
          --font-size-fluid-1: clamp(1rem, 4vw, 1.5rem);
          --font-size-fluid-2: clamp(1.5rem, 6vw, 2.5rem);
          --font-size-fluid-3: clamp(2rem, 9vw, 3.5rem);
        
var(--font-size-fluid-0) Almost before you knew it, we'd touched ground. var(--font-size-fluid-1) Almost before you knew it, we'd touched ground. var(--font-size-fluid-2) Almost before you knew it, we'd touched ground. var(--font-size-fluid-3) Almost before you knew it, we'd touched ground.

Easing

Five strengths for the classic ease, ease-out, ease-in, and ease-in-out timing functions. Plus some extra easings for mock elasticity and physics!

The Props

              --ease-{1-5}
              --ease-in-{1-5}
              --ease-out-{1-5}
              --ease-in-out-{1-5}

              --ease-elastic-out-{1-5}
              --ease-elastic-in-{1-5}
              --ease-elastic-in-out-{1-5}

              --ease-spring-{1-5}
              --ease-bounce-{1-5}

              --ease-step-{1-5}

              /* will be removed in v2 */
              --ease-elastic-{1-5}        /* deprecated; equal to elastic-out  */
              --ease-squish-{1-5}         /* deprecated; equal to elastic-in-out  */
            
Usage Sample

            .slight-ease {
              animation: fade-in 300ms var(--ease-1);
            }

            .dramatic-ease {
              animation: fade-in 1s var(--ease-5);
            }

            .bouncy {
              animation: slide-in-up 3s var(--ease-bounce-2);
            }
          
Ease
ease-1
ease-2
ease-3
ease-4
ease-5
Ease In
ease-in-1
ease-in-2
ease-in-3
ease-in-4
ease-in-5
Ease Out
ease-out-1
ease-out-2
ease-out-3
ease-out-4
ease-out-5
Ease In Out
ease-in-out-1
ease-in-out-2
ease-in-out-3
ease-in-out-4
ease-in-out-5
Ease Elastic Out
ease-elastic-out-1
ease-elastic-out-2
ease-elastic-out-3
ease-elastic-out-4
ease-elastic-out-5
Ease Elastic In
ease-elastic-in-1
ease-elastic-in-2
ease-elastic-in-3
ease-elastic-in-4
ease-elastic-in-5
Ease Elastic In Out
ease-elastic-in-out-1
ease-elastic-in-out-2
ease-elastic-in-out-3
ease-elastic-in-out-4
ease-elastic-in-out-5
Ease Spring
ease-spring-1
ease-spring-2
ease-spring-3
ease-spring-4
ease-spring-5
Ease Bounce
ease-bounce-1
ease-bounce-2
ease-bounce-3
ease-bounce-4
ease-bounce-5
Ease Steps
ease-step-1
ease-step-2
ease-step-3
ease-step-4
ease-step-5

Animations

Premade keyframe effects allow you to orchestrate your own animations. Plus, a few nice attention-grabbers and indeterminate state animations.

The Props

              --animation-fade-{in,out}
              --animation-fade-{in,out}-bloom
              --animation-shake-{x,y,z}

              --animation-slide-out-{up,down,left,right}
              --animation-slide-in-{up,down,left,right}

              --animation-spin
              --animation-ping
              --animation-blink
              --animation-float
              --animation-bounce
              --animation-pulse
            
Usage Sample

            .loaded {
              animation: var(--animation-fade-in) forwards;
            }

            .actionsheet {
              animation: var(--animation-slide-out-down) forwards;

              &.open {
                animation: var(--animation-slide-in-up) forwards;
              }
            }

            .alert {
              animation: var(--animation-blink);
            }
          
Samples
Fade In
Fade Out
Bloom Fade In
Bloom Fade Out
Scale Up
Scale Down
Slide Out Up
Slide Out Down
Slide Out Right
Slide Out Left
Slide In Up
Slide In Down
Slide In Right
Slide In Left
Spin
Ping
Blink
Float
Bounce
Pulse
Shake X
Shake Y
Shake Z

Combine 'em!

Slide Fade

                .slide-fade {
                  animation:
                    var(--animation-fade-out) forwards,
                    var(--animation-slide-out-down);
                  animation-timing-function: var(--ease-elastic-in-out-3);
                  animation-duration: 1s;
                }
              
Shake In

                .shake-in {
                  animation:
                    var(--animation-shake-y),
                    var(--animation-fade-in),
                    var(--animation-slide-in-left);
                }
              
Push Out

                .push-out {
                  animation:
                    var(--animation-scale-down),
                    var(--animation-fade-out);
                  animation-timing-function: var(--ease-elastic-in-out-4);
                }
              

Sizes

Sizes use relative units by default with rem but static, px-based units are also available. 0s are unsafe but common negative values, while 1-N are safe.

The Props

            --size-{000-15}
            --size-px-{000-15}
            --size-fluid-{1-10}
            --size-content-{1-3}
            --size-header-{1-3}
            --size-relative-{000-15}
          
Document Relative Sizes

              --size-000: -.5rem;
              --size-00: -.25rem;
              --size-1: .25rem;
              --size-2: .5rem;
              --size-3: 1rem;
              --size-4: 1.25rem;
              --size-5: 1.5rem;
              --size-6: 1.75rem;
              --size-7: 2rem;
              --size-8: 3rem;
              --size-9: 4rem;
              --size-10: 5rem;
              --size-11: 7.5rem;
              --size-12: 10rem;
              --size-13: 15rem;
              --size-14: 20rem;
              --size-15: 30rem;
            
Static Sizes

              --size-px-000: -8px;
              --size-px-00: -4px;
              --size-px-1: 4px;
              --size-px-2: 8px;
              --size-px-3: 16px;
              --size-px-4: 20px;
              --size-px-5: 24px;
              --size-px-6: 28px;
              --size-px-7: 32px;
              --size-px-8: 48px;
              --size-px-9: 64px;
              --size-px-10: 80px;
              --size-px-11: 120px;
              --size-px-12: 160px;
              --size-px-13: 240px;
              --size-px-14: 320px;
              --size-px-15: 480px;
            
Usage Sample

            article {
              display: grid;
              gap: var(--size-3);
            }

            li {
              padding-inline-start: var(--size-2);
            }

            .icon {
              inline-size: var(--size-5);
              block-size: var(--size-5);
            }
          
Fluid Sizes

              --size-fluid-1: clamp(.5rem, 1vw, 1rem);
              --size-fluid-2: clamp(1rem, 2vw, 1.5rem);
              --size-fluid-3: clamp(1.5rem, 3vw, 2rem);
              --size-fluid-4: clamp(2rem, 4vw, 3rem);
              --size-fluid-5: clamp(4rem, 5vw, 5rem);
              --size-fluid-6: clamp(5rem, 7vw, 7.5rem);
              --size-fluid-7: clamp(7.5rem, 10vw, 10rem);
              --size-fluid-8: clamp(10rem, 20vw, 15rem);
              --size-fluid-9: clamp(15rem, 30vw, 20rem);
              --size-fluid-10: clamp(20rem, 40vw, 30rem);
            
Usage Sample

            body {
              padding: var(--size-fluid-3);
            }

            hr {
              margin-block: var(--size-fluid-5);
            }
          
Reading Content Sizes

              --size-content-1: 20ch;
              --size-content-2: 45ch;
              --size-content-3: 60ch;
            
Usage Sample

            p {
              max-inline-size: var(--size-content-3);
            }

            aside {
              max-inline-size: var(--size-content-2);
            }
          

Carrot cake gummi bears sweet caramels cotton candy topping.

Carrot cake gummi bears sweet caramels cotton candy topping. Jelly candy apple pie gingerbread tootsie roll chupa chups.

Carrot cake gummi bears sweet caramels cotton candy topping. Jelly candy apple pie gingerbread tootsie roll chupa chups. Gummi bears lollipop apple pie pudding tart cake jelly. Soufflé lollipop jelly-o chocolate bar icing bonbon.

Headline Content Sizes

              --size-header-1: 20ch;
              --size-header-2: 25ch;
              --size-header-3: 35ch;
            
Usage Sample

            h1 {
              max-inline-size: var(--size-header-2);
            }

            small {
              max-inline-size: var(--size-header-1);
            }
          
Carrot cake gummi bears sweet caramel candy.
Carrot cake gummi bears sweet caramels cotton candy topping.
Carrot cake gummi bears sweet caramels cotton candy topping. Jelly candy apple pie gingerbread tootsie roll chupa chups.
Relative Sizes

              --size-relative-000: -.5ch;
              --size-relative-00: -.25ch;
              --size-relative-1: .25ch;
              --size-relative-2: .5ch;
              --size-relative-3: 1ch;
              --size-relative-4: 1.25ch;
              --size-relative-5: 1.5ch;
              --size-relative-6: 1.75ch;
              --size-relative-7: 2ch;
              --size-relative-8: 3ch;
              --size-relative-9: 4ch;
              --size-relative-10: 5ch;
              --size-relative-11: 7.5ch;
              --size-relative-12: 10ch;
              --size-relative-13: 15ch;
              --size-relative-14: 20ch;
              --size-relative-15: 30ch;
            

Borders

Sizes, corner radii, a circle helper, conditional radii, radii that produce a hand-drawn border, and some blobs.

Vars Sample

              --border-size-{1-5}
              --radius-{1-6}
              --radius-round
              --radius-drawn-{1-6}
              --radius-blob-{1-5}
              --radius-conditional-{1-6}
            
Usage Sample

            .card {
              /* no radius when fullscreen */
              border-radius: var(--radius-conditional-3);
              border: var(--border-size-1) solid var(--gray-1);
            }

            .circle {
              inline-size: var(--size-5);
              aspect-ratio: var(--ratio-square);
              border-radius: var(--radius-round);
            }

            .drawn {
              inline-size: var(--size-14);
              border: var(--brown-12) var(--border-size-4) solid;
              border-radius: var(--radius-drawn-1);
            }
          

Border Size

1
2
3
4
5

Border Radius

1
2
3
4
5
round

Drawn Borders

1
2
3
4
5
6

Blobs

1
2
3
4
5

Z Index

All the z-index values you could possibly need!

The Props

              --layer-{1-5}
              --layer-important: 2147483647;
            
Usage Sample

            figure {
              position: relative;

              & figcaption {
                position: absolute;
                z-index: var(--layer-1);
                inset-inline: 0;
                inset-block: auto 0;
              }
            }

            .desperate-measures {
              position: fixed;
              z-index: var(--layer-important);
            }
          

Media Queries

Currently one step ahead of the CSS spec, Open Props offers named media queries with the @custom-media syntax. Available only with this PostCSS plugin, for now 😈

Media query widths also available as custom properties. Use like var(--size-sm)
xxs
240px
xs
360px
sm
480px
md
768px
lg
1024px
xl
1440px
xxl
1920px
The Props

              --portrait
              --landscape

              --{xxs,xs,sm,md,lg,xl,xxl}-only
              --{xxs,xs,sm,md,lg,xl,xxl}-n-above
              --{xxs,xs,sm,md,lg,xl,xxl}-n-below
              --{xxs,xs,sm,md,lg}-phone
            
Viewport Vars Sample

              @custom-media --portrait      (orientation: portrait);
              @custom-media --landscape     (orientation: landscape);

              @custom-media --md-only       (480px <= width < 768px);
              @custom-media --md-n-above    (width >= 768px);
              @custom-media --md-n-below    (width < 768px);
              @custom-media --md-phone      (--md-only) and (--portrait);

              @custom-media --xxl-only      (1440px <= width < 1920px);
              @custom-media --xxl-n-above   (width >= 1920px);
              @custom-media --xxl-n-below   (width < 1920px);
            
Capability Vars

              @custom-media --touch    (hover: none) and (pointer: coarse);
              @custom-media --stylus   (hover: none) and (pointer: fine);
              @custom-media --pointer  (hover) and (pointer: coarse);
              @custom-media --mouse    (hover) and (pointer: fine);

              @custom-media --HDcolor  (dynamic-range: high) or (color-gamut: p3);
            
Preference Vars

              @custom-media --OSdark        (prefers-color-scheme: dark);
              @custom-media --OSlight       (prefers-color-scheme: light);

              @custom-media --motionOK      (prefers-reduced-motion: no-preference);
              @custom-media --motionNotOK   (prefers-reduced-motion: reduce);

              @custom-media --invertedColors  (inverted-colors: inverted);
              @custom-media --forcedColors  (forced-colors: active);
            
Preference Vars Extended

              @custom-media --highContrast  (prefers-contrast: more);
              @custom-media --lowContrast   (prefers-contrast: less);

              @custom-media --opacityOK     (prefers-reduced-transparency: no-preference);
              @custom-media --opacityNotOK  (prefers-reduced-transparency: reduce);

              @custom-media --useDataOK     (prefers-reduced-data: no-preference);
              @custom-media --useDataNotOK  (prefers-reduced-data: reduce);
            
Light / Dark Usage Samples

            html {
              background: white;
              color: var(--gray-8);
            }

            @media (--OSdark) {
              html {
                background: var(--gray-9);
                color: var(--gray-1);
              }
            }
          
Reducing Motion Usage Samples

            transform: translateX(100%);

            @media (--motionOK) {
              transition: transform .5s var(--ease-3);
            }
          

Masks

Rad edges and corner-cuts ready to go. A huge shout out to Temani Afif and their amazing mask work. Be sure to check out their CSS Generators too; customize the size and distribution of these masks. Try on Codepen.

Not part of the main bundle. Must be individually imported.
NPM Imported Usage Sample

            @import "open-props/masks/edges";
            @import "open-props/masks/corner-cuts";

            .box-with-corner-cuts {
              -webkit-mask: var(--mask-corner-cut-angles-2);
            }

            .box-with-zig-zag-on-bottom {
              -webkit-mask: var(--mask-edge-zig-zag-bottom);
            }
          

Mask Edges


            /* NPM */
            @import "open-props/masks/edges";
            @import "open-props/src/props.masks.edges.css";
            @import "open-props/masks.edges.min.css";

            /* CDN */
            @import "https://unpkg.com/open-props/masks.edges.min.css";
          
Scoops
Top
Right
Bottom
Left
Vertical
Horizontal

          --mask-edge-scoop-{top,right,bottom,left,vertical,horizontal}

          .mask-usage {
            -webkit-mask: var(--mask-edge-scoop-top);
          }
        

Scalloped
Top
Right
Bottom
Left
Vertical
Horizontal
All

          --mask-edge-scalloped-{edges,top,right,bottom,left,vertical,horizontal}

          .mask-usage {
            -webkit-mask: var(--mask-edge-scalloped-edges);
          }
        

Drips
Top
Right
Bottom
Left
Vertical
Horizontal

          --mask-edge-drip-{top,right,bottom,left,vertical,horizontal}

          .mask-usage {
            -webkit-mask: var(--mask-edge-drip-bottom);
          }
        

Zig-Zag
Top
Right
Bottom
Left
Vertical
Horizontal

          --mask-edge-zig-zag-{top,right,bottom,left,vertical,horizontal}

          .mask-usage {
            -webkit-mask: var(--mask-edge-zig-zag-bottom);
          }
        

Mask Corner Cuts


            /* NPM */
            @import "open-props/masks/corner-cuts";
            @import "open-props/src/props.masks.corner-cuts.css";
            @import "open-props/masks.corner-cuts.min.css";

            /* CDN */
            @import "https://unpkg.com/open-props/masks.corner-cuts.min.css";
          
Circles
1
2
3

            --mask-corner-cut-circles-{1,2,3}

            .mask-usage {
              -webkit-mask: var(--mask-corner-cut-circles-2);
            }
          

Squares
1
2
3

            --mask-corner-cut-squares-{1,2,3}

            .mask-usage {
              -webkit-mask: var(--mask-corner-cut-squares-2);
            }
          
Angles
1
2
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            --mask-corner-cut-angles-{1,2,3}

            .mask-usage {
              -webkit-mask: var(--mask-corner-cut-angles-2);
            }