I am working on adding a third column to the custom skin. I have everything where I want it on the page, but I can't seem to find where the borders are declared in the CSS.

You can take a look at the page here:

http://conservativerevolution.com/blogx/index.php?blog=2

I have went through every .css file I can find, but I can't seem to find where those borders are declared. Any help would be great.