changing background color

I am brand new to this product. Setting up store, going to be as generic as I can get away with. The store is loaded with a basic grey background. When I say background I mean the farthest edges of the screen encompassing the head and footer area. Where is this color controlled from? I looked at the .css files but don't know what line it is. 

Secondly

I would also like to know what this line of code from pcheader11.css controls. I changed the background color and did not see a change anywhere.

body {
    padding: 0;
    margin: 0;
    font-family: Tahoma, Geneva, sans-serif;
    font-size: 12px;
    color: #666;
    background-image: url(images/pc11-bg.png);
    background-color: #2755a7;
}

/* ----- Header - Start ----- */


Thanks

Hi Chris,

Ah yes, good ol' StoreFront 5. I remember it well ... though I couldn't say fondly ;-)