I like to change the background color of my page to either
1. image or
2. gradient color
Sidenote: make a backup copy of each file that you edit so that you can revert to it if you don't like your changes.
Open up this file:
Look for :
background: url(images/cw-bg2.gif) no-repeat 50% 0;
Change that to this:
(of course change the black to whatever color you want.