You have an additional stylesheet named stylesheet_tm.css, which duplicates the body {} rule. Anything in that file will override any conflicting settings you make in your main stylesheet.css.
Find this in stylesheet_tm.css:
Code:
body{
padding:0;
margin:0;
width:100%;
vertical-align:top;
font-family:tahoma;
background:#fff;
color:#000; line-height:13px; font-size:10px;
}
and change the background there. Also change the rule for .main_w {} which is a TM-specific class:
Code:
body{
padding:0;
margin:0;
width:100%;
vertical-align:top;
font-family:tahoma;
background:#e5edf5;
color:#000; line-height:13px; font-size:10px;
}
.main_w {width:765px; margin:auto; background-color: #fff;}