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The design system that powers GitHub

Install Primer 10.7.0

👋 Our new documentation site is public! Check out for design guidelines, tooling, and resources for building websites with Primer. It's a work in progress and there are still some bugs to fix and improvements to make, if you'd like to share feedback or report bugs please open an issue.


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.