unocss

Name: unocss
Author: onmax

github.com/onmaxDesign & UI723194 installsUpdated 3d ago

About unocss

UnoCSS is a flexible, extensible atomic CSS engine that supplies utility classes through presets. This skill covers its configuration, rules, presets, transformers, and Vite and Nuxt integrations.

Key features

01CSS utilities generated through presets
02Static and dynamic rules and shortcuts
03Theme, variant, and extraction configuration
04Icon, typography, and web font presets
05Variant grouping and directive transformers

Use cases

01Configure UnoCSS rules and themes in a project
02Choose a preset compatible with Tailwind syntax
03Use attributify transformers in JSX or TSX

Install

Copy the command and run it in a terminal.

$npx skills add https://github.com/onmax/nuxt-skills --skill unocss

After installing, type/unocssin Claude Code to confirm it loaded.

Bundled files

References and scripts installed along with SKILL.md.

references/

core-config.md

core-extracting.md

core-layers.md

core-processors.md

core-rules.md

core-safelist.md

core-shortcuts.md

core-theme.md

core-variants.md

integrations-nuxt.md

integrations-vite.md

preset-attributify.md

preset-icons.md

preset-mini.md

preset-rem-to-px.md

preset-tagify.md

preset-typography.md

preset-web-fonts.md

preset-wind3.md

preset-wind4.md

transformer-attributify-jsx.md

transformer-compile-class.md

transformer-directives.md

transformer-variant-group.md

Details

From the project README

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

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