A collection of CSS3 powered hover effects to be applied to links, buttons, logos, SVG, featured images and so on. Easily apply to your own elements, modify or just use for inspiration. Available i…

Primer is GitHub's design system. This is the CSS implementation

The U.S. Web Design System helps the federal government build fast, accessible, mobile-friendly websites.

📐 Simple, elegant and maintainable media queries in Sass

A Sass mixin that helps you compose media queries in an elegant way.

This CSS file intends to warn developers about possible risks and mistakes that exist in HTML code. It can also be used to roughly evaluate a site's quality by simply including it as an external st…

The repository for the Atomic Design book

💎 The powerful Sass library for creating CSS transitions and animations

Sass utilities for the frontend laborer.

Accessibility (A11Y) Style Guide

A Sass library for building immutable and namespaced BEM CSS objects

The (working) Visual, UI, and Front End Styleguide for edX.