Rounded Edges on main body/footer picture?

How was the rounded edges and footer image done on this? Seems pretty simple, but I'm not quite sure how. Any help would be great; Thanks!
-TR

http://veljko.forumotion.net/index.htm

To the top.

To the top, again.

Hello,

To make that, you can use this theme
http://en.hitskin.com/search-a-skin/underworld-sea-147712.htm

or put this code in Admin CP > Display > Colors > CSS and submit.
(PunBB only)

Code:

.main .main-head {
background : url(BACKGROUND IMAGE URL HERE) repeat-x;
}

So what exactly does that code do, the footer image...?

The code is for rounded corner.