Block padding issue

Hi,

I'm trying to firebug the block padding between custom divs in blocks, and I can't seem to find the css class that is causing padding between the blocks.

The URL I'm talking about can be found here: http://www.actonforum.homesteader.glexia.net/

The "Features" section, as you see with the guy with the different faces, there's about 15-20px padding between divs. Firebug won't tell me where that code is coming from. I've searched through the style.css and can't seem to find it either. I'm trying to change the value of that padding to a lesser number. Can you take a look and tell me where in the stylesheet the code is to change that padding/margin?

Thanks!