SASS installation
SASS is an extension of CSS3, adding nested rules, variables, mixins, selector inheritance, and more. It's translated to well-formatted, standard CSS using the command line tool or a web-framework plugin
First install ruby before installing SASS. SASS is built upon Ruby. If you are working on a MAC, chances are, you already have Ruby installed. If you may to install Ruby in Windows, use this Ruby Installer.
1) Install Ruby from http://rubyinstaller.org/