Table headings on arcade

ok so i updated my arcade skin so that it doesn't mirror my vbulletin skin exctly because it didn't look good with the transparency.

So i've edited the css templates etc and got everything how i like it so far, with one difficulty. That difficulty being the headings of the table sections, you can see here: http://www.gamerperfection.com/arcade.php

I'd like to make the grey more darker. But i couldn't find where to edit this? It didn't seem to be in the same place as i edited the other bits: CSS templates >> ARCADE.css ???

Any help on the header bits?

--------------- Added [DATE]1268561824[/DATE] at [TIME]1268561824[/TIME] ---------------

Don't worry, fixed it myself. Changed the Style Var - doc_backgroundcolor