Help...How to change sidebox header background color?

[misty]

Posting url of your site would help, but as am working in dark,
below is code for CLASSIC Template css file..

.leftBoxHeading, .centerBoxHeading, .rightBoxHeading {
 margin: 0em;
 background-color: #abbbd3;
 background-image: url(../images/tile_back.gif);
 padding: 0.5em 0.2em;
 }