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.* or unocss.config.* files before writing code to understand available presets and rules

INSTALLATION
npx skills add https://github.com/antfu/skills --skill unocss
Run in your project or agent environment. Adjust flags if your CLI version differs.

SKILL.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

TopicDescriptionReference
ConfigurationConfig file setup and all configuration optionscore-config
RulesStatic and dynamic rules for generating CSS utilitiescore-rules
ShortcutsCombine multiple rules into single shorthandscore-shortcuts
ThemeTheming system for colors, breakpoints, and design tokenscore-theme
VariantsApply variations like hover:, dark:, responsive to rulescore-variants
ExtractingHow UnoCSS extracts utilities from source codecore-extracting
Safelist & BlocklistForce include or exclude specific utilitiescore-safelist
Layers & PreflightsCSS layer ordering and raw CSS injectioncore-layers
ProcessorsTransform generated CSS layers (incl. Lightning CSS)core-processors

Presets

Main Presets

TopicDescriptionReference
Preset Wind3Tailwind CSS v3 / Windi CSS compatible preset (most common)preset-wind3
Preset Wind4Tailwind CSS v4 compatible preset with modern CSS featurespreset-wind4
Preset MiniMinimal preset with essential utilities for custom buildspreset-mini

Feature Presets

TopicDescriptionReference
Preset IconsPure CSS icons using Iconify with any icon setpreset-icons
Preset AttributifyGroup utilities in HTML attributes instead of classpreset-attributify
Preset TypographyProse classes for typographic defaultspreset-typography
Preset Web FontsEasy Google Fonts and other web fonts integrationpreset-web-fonts
Preset TagifyUse utilities as HTML tag namespreset-tagify
Preset Rem to PxConvert rem units to px for utilitiespreset-rem-to-px

Transformers

TopicDescriptionReference
Variant GroupShorthand for grouping utilities with common prefixestransformer-variant-group
DirectivesCSS directives: @apply, @screen, theme(), icon()transformer-directives
Compile ClassCompile multiple classes into one hashed classtransformer-compile-class
Attributify JSXSupport valueless attributify in JSX/TSXtransformer-attributify-jsx

Integrations

TopicDescriptionReference
Vite IntegrationSetting up UnoCSS with Vite and framework-specific tipsintegrations-vite
Nuxt IntegrationUnoCSS module for Nuxt applicationsintegrations-nuxt
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