This repo exposes a few scss files to show by example some simple yet usefull features of SASS.
In order to see what is going on, you'll need to compile those files into css files.
Koala app is an easy way of doing it.
See https://gist.github.com/jareware/4738651 for other examples
See https://www.sitepoint.com/8-tips-help-get-best-sass/ for tips