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Primer CSS

Primer CSS is a free, open-source design system. Primer is GitHub's design system. This is the CSS implementation. It has 13,044 GitHub stars and is released under the MIT license. A live demo is linked from this page. Start a project with npx degit primer/css or clone the repository.

github.com/primer/css (opens in a new tab)

Data as of from the GitHub API; description from the project's repository. Report an error

View on GitHub (opens in a new tab)Live demo (opens in a new tab)

Get started

Copy the files into a new folder with degit (no git history), or clone the repository with git.

Copy with degit
npx degit primer/css my-ui
cd my-ui
Or clone with git
git clone --depth 1 https://github.com/primer/css.git my-ui

Sources: GitHub docs on template repositories, degit.

About Primer CSS

This project is in KTLO mode! Use existing utility classes from this project where needed. For more complete patterns that include styling and markup, please use primer/react or, if necessary, primer/view_components.

GitHub preview card for primer/css
GitHub social preview of primer/css. Open the live demo for the real design.

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FAQ

Primer CSS FAQ

Still curious? Email info@appsgit.com.

How do I use Primer CSS?

Copy the files into a new folder with npx degit primer/css my-ui (no git history), or fork the repository on GitHub. Then follow the README for the install and dev commands.

Can I use Primer CSS for commercial projects?

Yes. Primer CSS is released under the MIT license, a permissive license that allows commercial use as long as you keep the copyright and license notice. Third-party assets bundled with it (images, fonts, icons) may have their own terms.

Is Primer CSS maintained?

The repository's most recent commit was on Oct 21, 2026. Its latest release is v22.3.0. appsgit only lists templates from repositories with a commit in the last six months.