unocss
Instant atomic CSS engine with Tailwind CSS compatibility and flexible preset-based architecture.
- Superset of Tailwind CSS with un-opinionated core; all utilities provided via presets including Wind3, Wind4, Mini, Icons, Attributify, Typography, and Web Fonts
- Supports static and dynamic rules, shortcuts, theming, variants, and CSS layers for fine-grained styling control
- Includes transformers for variant grouping, CSS directives (@apply, @screen, theme()), and JSX attributify support
- Integrates with Vite and Nuxt; always check for
uno.config.*orunocss.config.*files before writing code to understand available presets and rules
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 66.x, generated at 2026-01-28.
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 |
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