# Primer CSS (Design systems)

> Primer CSS is a free, open-source design system. Primer is GitHub's design system. This is the CSS implementation. It has 13,027 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.

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.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/primer/css |
| Built with | not detected |
| Live demo | https://primer.style/css |
| GitHub template repository | no |
| GitHub stars | 13,027 |
| License | MIT |
| Language | SCSS |
| Official | no |
| Category | Design systems |
| Latest release | v22.3.0 (Jun 17, 2026) |
| Last commit | Oct 7, 2026 |

## Get started

### Copy with degit

```sh
npx degit primer/css my-ui
cd my-ui
```

### Or clone with git

```sh
git clone --depth 1 https://github.com/primer/css.git my-ui
```

Commercial use depends on the MIT license. Sources: https://docs.github.com/en/repositories/creating-and-managing-repositories/creating-a-repository-from-a-template, https://github.com/Rich-Harris/degit

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