GitHub’s CSS toolkit and guidlines


Primer is GitHub’s internal CSS framework. It includes basic global styling for typography, small components like buttons and tabs, and our general guidelines for writing HTML and CSS.

Primer Grid Demo



You’ll need the following dependencies installed:

  • Latest Jekyll (minimum v2.2.0): $ gem install jekyll
  • Latest Rouge: $ gem install rouge
  • Latest Sass: $ gem install sass
  • Latest Grunt CLI: $ npm install -g grunt-cli
  • Node.js and npm

Browser support

  • Internet Explorer 9+
  • Latest Chrome, Safari and Firefox

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