The Lapis web framework is amazing, but we likely want some kind of CSS library as well. Writing CSS from scratch is miserable, even with Sass. That's why we use something like Bourbon and Refills
Spend less time worrying about browser compatibility nonsense, and more time actually designing awesome websites. Straight to the good stuff.
This is also why you should use Font Awesome. The symbol set of 500+ icons is epic, and it just works, brilliantly.