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The design system that powers GitHub

Install Primer 10.5.0

Primer has undergone a lot of changes in the past 18 months. We've been consolidating and updating the CSS to make more resuable and flexible styles, we turned Primer into a monorepo and improved our build process, and we've been building a new documentation website that we'll making public soon. In the meantime, you can still view the old documentation website, view rendered examples of Primer styles in storybook, or you can find up-to-date documentation for styles within the or docs folder of each Primer module.


Primer CSS includes 30 packages that are grouped into 3 core meta-packages for easy install. Each package and meta-package is independently versioned and distributed via npm, so it's easy to include all or part of Primer within your own project.