tailwindcss

Utility-first CSS uses low-level, single-purpose classes applied directly in markup to compose styles. Tailwind CSS generates only the utilities you use, scanning source files at build time to eliminate unused CSS and produce lean production bundles while enabling rapid responsive design without custom stylesheets.

Tailwind CSS is framework-agnostic and works seamlessly with React, Vue, Svelte, Next.js, Nuxt, and other modern web frameworks. Install via npm, configure your build tool (Vite, Next.js, etc.), import Tailwind directives into your CSS, then apply utility classes in your component templates.

Tailwind CSS supports dark mode theming through configuration. Define theme tokens for colors, spacing, and typography in your config file, use dark mode modifiers (dark:) for dark variants, and customize design system tokens to maintain consistency across your entire application.

Utility-first styling applies pre-defined single-purpose classes directly in markup instead of writing custom CSS rules. This approach reduces stylesheet size through dead code elimination, speeds up development by eliminating context-switching, and ensures consistent design tokens across components without duplicating style definitions.

Tailwind CSS requires minimal setup: install dependencies, initialize configuration, import Tailwind directives into your CSS entry point, and configure your build tool to scan source files. While it works with sensible defaults, you can customize theme tokens, extend utilities, and enable plugins to match your design system.

Tailwind CSS scans your source files at build time to detect which utilities you actually use, then generates only those CSS classes. Unused utilities are eliminated entirely, resulting in significantly smaller production CSS bundles compared to traditional frameworks that ship all possible styles by default.