Make the forums overview more compact?

[AvocentX]

I have a problem with getting my forums as "compact" as i want them. As it is now, the height of each forum is to large. I want the height reduced to get the forums more compact looking.

My forums are located here

I have gone through a lot of the Stylevars but not been able to find the proper value(s).
If someone could also send a link to where there Stylevars are described would be great!