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Primer CSS
Primer is the CSS framework that powers GitHub's front-end design. Primer CSS includes 23 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.
Packages
The Primer CSS repo is managed as a monorepo that is composed of many npm packages.
Core Packages
| Package | Version |
|---|---|
| primer-css Includes all 23 packages |
|
| primer-core |  |
| primer-product |  |
| primer-marketing |  |
Install
This repository is distributed with npm. After installing npm, you can install primer-css with this command.
$ npm install --save primer-css
Usage
The source files included are written in Sass (SCSS). After installing with npm, you can add your project's node_modules directory to your Sass include paths (AKA load paths in Ruby), then import it like this:
@import "primer-css/index.scss";
You can import individual Primer modules by installing them with npm, for instance:
$ npm install --save primer-navigation
Then, you would import the module with:
@import "primer-navigation/index.scss";
Or, while you're figuring out which modules you need, you can import them directly from the primer-css packages directory like so:
@import "primer-css/modules/primer-navigation/index.css";
Build
For a compiled CSS version of this module, an npm script is included that will output a CSS version to build/build.css. The built CSS file is also included in the npm package.
$ npm run build
Documentation
You can read more about primer in the docs.