/unocss

name: unocss
description: 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.
metadata:
  author: Anthony Fu
  version: "2026.9.25"
  source: Generated from https://github.com/unocss/unocss, scripts located at https://github.com/antfu/skills

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](references/core-config.md) | | Rules | Static and dynamic rules for generating CSS utilities | [core-rules](references/core-rules.md) | | Shortcuts | Combine multiple rules into single shorthands | [core-shortcuts](references/core-shortcuts.md) | | Theme | Theming system for colors, breakpoints, and design tokens | [core-theme](references/core-theme.md) | | Variants | Apply variations like hover:, dark:, responsive to rules | [core-variants](references/core-variants.md) | | Extracting | How UnoCSS extracts utilities from source code | [core-extracting](references/core-extracting.md) | | Safelist & Blocklist | Force include or exclude specific utilities | [core-safelist](references/core-safelist.md) | | Layers & Preflights | CSS layer ordering and raw CSS injection | [core-layers](references/core-layers.md) | | Processors | Transform generated CSS layers (incl. Lightning CSS) | [core-processors](references/core-processors.md) |

Presets

Main Presets

| Topic | Description | Reference | |-------|-------------|-----------| | Preset Wind3 | Tailwind CSS v3 / Windi CSS compatible preset (most common) | [preset-wind3](references/preset-wind3.md) | | Preset Wind4 | Tailwind CSS v4 compatible preset with modern CSS features | [preset-wind4](references/preset-wind4.md) | | Preset Mini | Minimal preset with essential utilities for custom builds | [preset-mini](references/preset-mini.md) |

Feature Presets

| Topic | Description | Reference | |-------|-------------|-----------| | Preset Icons | Pure CSS icons using Iconify with any icon set | [preset-icons](references/preset-icons.md) | | Preset Attributify | Group utilities in HTML attributes instead of class | [preset-attributify](references/preset-attributify.md) | | Preset Typography | Prose classes for typographic defaults | [preset-typography](references/preset-typography.md) | | Preset Web Fonts | Easy Google Fonts and other web fonts integration | [preset-web-fonts](references/preset-web-fonts.md) | | Preset Tagify | Use utilities as HTML tag names | [preset-tagify](references/preset-tagify.md) | | Preset Rem to Px | Convert rem units to px for utilities | [preset-rem-to-px](references/preset-rem-to-px.md) |

Transformers

| Topic | Description | Reference | |-------|-------------|-----------| | Variant Group | Shorthand for grouping utilities with common prefixes | [transformer-variant-group](references/transformer-variant-group.md) | | Directives | CSS directives: @apply, @screen, theme(), icon() | [transformer-directives](references/transformer-directives.md) | | Compile Class | Compile multiple classes into one hashed class | [transformer-compile-class](references/transformer-compile-class.md) | | Attributify JSX | Support valueless attributify in JSX/TSX | [transformer-attributify-jsx](references/transformer-attributify-jsx.md) |

Integrations

| Topic | Description | Reference | |-------|-------------|-----------| | Vite Integration | Setting up UnoCSS with Vite and framework-specific tips | [integrations-vite](references/integrations-vite.md) | | Nuxt Integration | UnoCSS module for Nuxt applications | [integrations-nuxt](references/integrations-nuxt.md) |