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The instant on-demand Atomic CSS engine.
The newest version!







UnoCSS


The instant on-demand Atomic CSS engine.






💡 I highly recommend reading this blog post - 
Reimagine Atomic CSS
for the story behind





📚 Documentation |
🧑‍💻 Interactive Docs |
🤹‍♂️ Playground |
🎓 Tutorial




## Features

Inspired by [Windi CSS](http://windicss.org/), [Tailwind CSS](https://tailwindcss.com/), and [Twind](https://github.com/tw-in-js/twind), but:

- [Fully customizable](https://unocss.dev/config/) - no core utilities. All functionalities are provided via presets.
- No parsing, no AST, no scanning, it's **INSTANT** (5x faster than Windi CSS or Tailwind JIT).
- ~6kb min+brotli - zero deps and browser friendly.
- [Shortcuts](https://unocss.dev/config/shortcuts) - aliasing utilities, dynamically.
- [Attributify mode](https://unocss.dev/presets/attributify/) - group utilities in attributes.
- [Pure CSS Icons](https://unocss.dev/presets/icons/) - use any icon as a single class.
- [Variant Groups](https://unocss.dev/transformers/variant-group) - shorthand for group utils with common prefixes.
- [CSS Directives](https://unocss.dev/transformers/directives) - reuse utils in CSS with `@apply` directive.
- [Compilation mode](https://unocss.dev/transformers/compile-class/) - synthesizes multiple classes into one at build time.
- [Inspector](https://unocss.dev/tools/inspector) - inspect and debug interactively.
- [CSS-in-JS Runtime build](https://unocss.dev/integrations/runtime) - use UnoCSS with one line of CDN import.
- [VS Code extension](https://marketplace.visualstudio.com/items?itemName=antfu.unocss)
- Code-splitting for CSS - ships minimal CSS for MPA.

## Documentation

Read the [documentation](https://unocss.dev/) for more details.

## Installation

- [Vite](https://unocss.dev/integrations/vite)
- [Nuxt](https://unocss.dev/integrations/nuxt)
- [Astro](https://unocss.dev/integrations/astro)
- [Webpack](https://unocss.dev/integrations/webpack)
- [CDN Runtime](https://unocss.dev/integrations/runtime)
- [CLI](https://unocss.dev/integrations/cli)
- [VS Code extension](https://unocss.dev/integrations/vscode)
- [ESLint Config](https://unocss.dev/integrations/eslint)
- [PostCSS](https://unocss.dev/integrations/postcss)

## Acknowledgement

UnoCSS is made possible thanks to the inspirations from the following projects:

> in alphabetical order

- [ACSS](https://acss.io/)
- [Bootstrap Utilities](https://getbootstrap.com/docs/5.1/utilities/flex/)
- [Chakra UI Style Props](https://chakra-ui.com/docs/features/style-props)
- [Semantic UI](https://semantic-ui.com/)
- [Tachyons](https://tachyons.io/)
- [Tailwind CSS](https://tailwindcss.com/)
- [Twind](https://github.com/tw-in-js/twind)
- [Windi CSS](http://windicss.org/)

## Sponsors


  
    
  


## License

[MIT](./LICENSE) License © 2021-PRESENT [Anthony Fu](https://github.com/antfu)