I've been wanting to do this forever, but this Pen http://codepen.io/Tresva/pen/dxHsb finally pushed me over the edge to do it.
Inspired by Mark Otto's tour of GitHub's CSS and Ian Feather's tour of Lonely Planet's CSS, I thought I would join the party and talk about how we do CSS at CodePen.
 We use SCSS.
Is that a random document.write in the <head> not in <script> tags? Good luck with that hoss. Nice charset too. Wait. Does that say <script type="text/computert">?
Listen we all...
There is one block of CSS that I find myself writing all the time. It's this:
position: absolute;top: 0;left: 0;width: 100%;height: 100%;
The ol' cover e-v-e-r-y-t-i-n-g block. That's the kind of...
Need to know how to enable it? Go here.