Here is the css for your background:
background:#BA3402 url(../images/bg.png) repeat-x scroll 0pt;
If you want your bg.png image to go all the way to the bottom, you can change your css to this:
background:#BA3402 url(../images/bg.png) repeat scroll 0pt;
It would look better if your gradient was faded from top to bottom. Then you could add your bottom gradient color to the background.
#BA3402 is that reddish color.