tabslight floatcontainer?

[Roidon]

Hey, I hope this is the right place to post my question, if it's not, let me know.

I recently installed vBExperience 4 (which is brilliant), but I'm having to fix a bunch of stuff in the style. Not a problem, figuring most of it out through trial and error, but one's stumped me.

Here's a picture of the problem.

I can't figure out how to change the highlighted background color of the tabs.

Viewing the source code points me to <dl class="tabslight floatcontainer">, but I can't find it anywhere.

A point in the right direction would be much appreciated.

Thanks.