Learn more about this styleguide, particularly how it’s built and who maintains it.

What and why

Primer is GitHub’s internal CSS framework. It includes basic global styling for utilities, objects, components, and our general guidelines for writing HTML and CSS. It’s been used internally at GitHub for years now.

Future Updates

Primer is currently being overhauled. The upcoming version of Primer will add new styles and bring the existing styles up to date, improve the build process, and include new and improved documentation. New styles will be open-sourced in the Primer repo and on npm as we add them, and the new documentation site will be shared when it's complete, currently slated to happen in mid-to-late 2017.


Maintained by the GitHub Design Systems team.