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

unocss

Core

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