changing background color of forums

[imported_blackbird]

I'm changing the color scheme of my vBulletin board and am having trouble finding in the CSS where the setting is the for the main table where on the main page, the forums are listed and within forums, the threads are listed. Like on http://www.vbulletin.com/forum/ the column backgrounds of "last post" and "posts" are blue while the ones for "Forum" and "Threads" are white. I couldn't find it in the Main CSS settings. The same color scheme is in the top with "vBulletin Community Forum" and the log-in area.

Also, my category titles aren't using the gradient graphic, even though I left the coding for that the exact same as in the default style. I changed the graphic, left it the same name as the original, and overwrote the one on the server. Instead of getting a black gradient, I just get a solid black background.