A friend of mine asked me to make a dark theme of the site to use for him. Figured I'd release it to the public as well. Its mostly just recolouring of elements, but I also fixed a couple small bugs. Tested on Chromium/Firefox on both windows and linux. Dunno how it looks on IE/Safari/Opera. Some stuff is likely to break with any site updates, and I'll try to keep this up to date.
On Chromium, remove the @moz-document wrapper and specifiy the url as http://over.gg from the Stylish GUI.
EDIT: updated for the recent site changes