Best Answer Rob , 11 March 2013 - 09:13 PM
The WP-Boxer plugin has built in settings to create borders around what it calls "Content Blocks", which are essentially, the same as boxes. You could do that without any real coding experience or CSS skills.
If you'd prefer boxes, the CSS element you're looking for is: .grid-element, .media_overview
The rest is simply adding the CSS to this, but keep in mind, you'll need to make some adjustments to things like padding, margins, etc.Go to the full post