Bootstrap is now a staple when it comes to bootstrapping web applications today. There has been attempts to unseat it as the king of css toolkits.

Github’s CSS toolkit is here now. PrimerCSS is used by Github itself. It is open source and released using the MIT License like SCSS, Jekyll and Grunt. PrimerCSS currently supports Internet Explorer 9+, Chrome, Safari, and Firefox on OS X and Windows.

PrimerCSS Components


Primercss sample