Syntactically Awesome Style Sheets (SASS)

Sass is the most mature, stable, and powerful professional grade CSS extension language in the world. Sass is completely compatible with all versions of CSS. CSS on its own can be fun, but stylesheets are getting larger, more complex, and harder to maintain. This is where a preprocessor can help. Sass has features that don’t exist in CSS yet like nesting, mixins, inheritance, and other nifty goodies that help you write robust, maintainable CSS.