Sass

Sass

Sassy-css - used by google material design and by many other component. It is just an easier way to write css and has some cool option that includes "variables". Sass is fully compatible with css, so you can just write usual css and from time to time use a feature. File extension .scss and .sass

Website Link http://sass-lang.com/

Installation instructions on OSX:

gem install sass

or

sudo gem install sass

Double check that it is running:

sass -v

Run automatic conversion:

sass --watch sass:css

(takes the folder "sass" and watches it, outputs all changes to "css" folder)