[KTBleeding]

To have it like it's displayed in your screen shot, you'll have to do this:

Login to the admincp, click on Styles & Templates, then Style Manager, then click the "GO" button next to the skin you want to edit..

Now find the "Page Background" CSS block and insert this into the "Extra CSS Attributes"

border-left: 1px solid #000;
border-right: 1px solid #000;

Change the "000" to whatever border color you want.

Now find the "Table Footer" CSS block and insert this in the same Extra CSS Attributes:

border-left: 1px solid #000;
border-right: 1px solid #000;
border-bottom: 1px solid #000;

Again, change the "000" to the color hex you want.