UnoCSS instant atomic CSS engine, superset of Tailwind CSS. Use when configuring UnoCSS, writing utility rules, shortcuts, or working with presets like Wind, Icons, Attributify.
Install
npx skills add https://github.com/antfu/skills --skill unocssSKILL.md
UnoCSS is an instant atomic CSS engine designed to be flexible and extensible. The core is un-opinionated - all CSS utilities are provided via presets. It's a superset of Tailwind CSS, so you can reuse your Tailwind knowledge for basic syntax usage.
Important: Before writing UnoCSS code, agents should check for uno.config.* or unocss.config.* files in the project root to understand what presets, rules, and shortcuts are available. If the project setup is unclear, avoid using attributify mode and other advanced features - stick to basic class usage.
The skill is based on UnoCSS v66.10.5, generated at 2026-09-25.
Core
| Topic | Description | Reference |
|---|---|---|
| Configuration | Config file setup and all configuration options | core-config |
| Rules | Static and dynamic rules for generating CSS utilities | core-rules |
| Shortcuts | Combine multiple rules into single shorthands | core-shortcuts |
| Theme | Theming system for colors, breakpoints, and design tokens | core-theme |
| Variants | Apply variations like hover:, dark:, responsive to rules | core-variants |
| Extracting | How UnoCSS extracts utilities from source code | core-extracting |
| Safelist & Blocklist | Force include or exclude specific utilities | core-safelist |
| Layers & Preflights | CSS layer ordering and raw CSS injection | core-layers |
| Processors | Transform generated CSS layers (incl. Lightning CSS) | core-processors |
Presets
Main Presets
| Topic | Description | Reference |
|---|---|---|
| Preset Wind3 | Tailwind CSS v3 / Windi CSS compatible preset (most common) | preset-wind3 |
| Preset Wind4 | Tailwind CSS v4 compatible preset with modern CSS features | preset-wind4 |
| Preset Mini | Minimal preset with essential utilities for custom builds | preset-mini |
Feature Presets
| Topic | Description | Reference |
|---|---|---|
| Preset Icons | Pure CSS icons using Iconify with any icon set | preset-icons |
| Preset Attributify | Group utilities in HTML attributes instead of class | preset-attributify |
| Preset Typography | Prose classes for typographic defaults | preset-typography |
| Preset Web Fonts | Easy Google Fonts and other web fonts integration | preset-web-fonts |
| Preset Tagify | Use utilities as HTML tag names | preset-tagify |
| Preset Rem to Px | Convert rem units to px for utilities | preset-rem-to-px |
Transformers
| Topic | Description | Reference |
|---|---|---|
| Variant Group | Shorthand for grouping utilities with common prefixes | transformer-variant-group |
| Directives | CSS directives: @apply, @screen, theme(), icon() | transformer-directives |
| Compile Class | Compile multiple classes into one hashed class | transformer-compile-class |
| Attributify JSX | Support valueless attributify in JSX/TSX | transformer-attributify-jsx |
Integrations
| Topic | Description | Reference |
|---|---|---|
| Vite Integration | Setting up UnoCSS with Vite and framework-specific tips | integrations-vite |
| Nuxt Integration | UnoCSS module for Nuxt applications | integrations-nuxt |
Related skills
vercel-react-best-practicesvercel-labs751KReact and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.vercel-composition-patternsvercel-labs361KReact composition patterns that scale. Use when refactoring components with boolean prop proliferation, building flexible component libraries, or designing reusable APIs. Triggers on tasks involving compound components, render props, context providers, or component architecture. Includes React 19 API changes.vercel-react-view-transitionsvercel-labs135KGuide for implementing smooth, native-feeling animations using React's View Transition API (`<ViewTransition>` component, `addTransitionType`, and CSS view transition pseudo-elements). Use this skill whenever the user wants to add page transitions, animate route changes, create shared element animations, animate enter/exit of components, animate list reorder, implement directional (forward/back) navigation animations, or integrate view transitions in Next.js. Also use when the user mentions viewpick-ui-libraryemilkowalski124KPick the right library for a given frontend task from a curated, opinionated list — numbers, OTP inputs, charts, command menus, virtualization, drag and drop, toasts, state, styling, and more. Only runs when explicitly invoked; it does not trigger on its own.