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  3. CSS Libraries

CSS Libraries

Utility-first and classic CSS frameworks.

Popular

Tailwind CSS

A utility-first CSS framework that lets developers build custom designs directly in markup without writing separate stylesheets.

CSS Libraries
Free
Open Source
utility-firstcssstylingresponsive
Official site Docs

Bootstrap

One of the earliest and most widely adopted CSS frameworks, offering a grid system and prebuilt components out of the box.

CSS Libraries
Free
Open Source
cssgridcomponentsresponsive
Official site Docs

Bulma

A modern CSS framework based on Flexbox that provides responsive layout and styling classes without any JavaScript dependency.

CSS Libraries
Free
Open Source
cssflexboxresponsiveno-js
Official site Docs
Trending

UnoCSS

An instant, on-demand atomic CSS engine that generates only the utility classes your markup actually uses, with a Tailwind-compatible preset for easy migration.

CSS Libraries
Free
Open Source
cssatomic-csstailwind-alternativevite
Official site

Pico CSS

A classless CSS framework that styles semantic HTML directly, so a plain document looks presentable with zero utility classes or component markup.

CSS Libraries
Free
Open Source
cssclasslessminimalsemantic-html
Official site

Foundation

Zurb's responsive front-end framework with a grid system, prebuilt UI components, and Sass customization, aimed at production marketing sites and web apps.

CSS Libraries
Free
Open Source
cssframeworkresponsivegrid
Official site

Open Props

A set of ready-to-use, well-considered CSS custom properties — colors, easings, shadows, gradients — for styling without a full utility framework or build step.

CSS Libraries
Free
Open Source
css-variablesdesign-tokenslightweightno-build
Official site Docs