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

The front-end CSS framework for building experiences for Office and Microsoft 365.

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

Compare the various managed cloud services offered by the major public cloud providers in the market.

Semantic UI, converted to Sass and ready to drop into Rails & Compass.

Sass utilities for the frontend laborer.

Intrinsic Design.