Windows 7 CSS Framework – 7.css
A CSS only front-end framework that brings the retro Windows 7 styles to your webpage.
Frameworks
Minimal Classless CSS Framework – Simple.css
A lightweight CSS framework (also considered as a CSS reset) that helps developers quickly build a minimal clean looking website.
Customizable Web Components UI Library – Shoelace
Shoelace is an open-source, highly customizable, framework-agnostic UI components library for modern web application design.
Responsive, Modern and Fully Customizable Pure CSS Framework – Punica
A lightweight, responsive, modern, and fully customizable front-end framework written in pure CSS/SASS/SCSS.
Bootstrap 5 & Material Design 2.0 UI KIT
A pure JavaScript/CSS UI Kit to help you quickly build Material Design web applications using Bootstrap 5 and 500+ built-in UI components.
Create Stunning Cyberpunk 2077 Themed Webpages with Cyberpunk.css
Experience the world of tomorrow on your website with the help of cyberpunk.css, a pure CSS library providing Cyberpunk 2077 themed elements.
Minimal Clean CSS Design System – Pico.css
Pico.css is a minimal, responsive, semantic, reader-centric design system implemented in pure CSS.
Fully Styled UI Component Library – PCUI
a fully styled UI component library for Vanilla JavaScript and React apps.
Full-featured CSS Utility Library – PrimeFlex
A lightweight, responsive, feature-rich, utility-first CSS framework for building modern websites.
Create Classic Mac OS Style Interfaces With The System.css Library
A CSS library for creating classic Apple Mac OS style interfaces through HTML and CSS markup.