How do you edit thread status icon style?

[politicalfray]

I recently changed my forum so that there are no more post icons. It worked, but the background color of the thread status icons is still the same as the column right next to it instead of alternating like the rest of the columns do. What template would I have to edit to fix this? I checked in forumdisplay, but I couldn't find it.

Any help would be appreciated. Thank you.