Edit background page 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:

http://guidoworks.net/tolax_test/templates/ja_purity/styles/background/lighter/style.css

Look for :

#ja-containerwrap2 {
background: url(images/cw-bg2.gif) no-repeat 50% 0;
}

Change that to this:

#ja-containerwrap2 {
background: #000000;
}

(of course change the black to whatever color you want.