[Mediawiki-l] Can I change the toolbox Style in main.css

[Julia Reek]

Hi,
at the moment i'm changing the layout of my media wiki...
but i have a big problem:

where can i change the style of the tool box!?
i'm using monobook. if i look at my page--> view page source--> it tell
me that the toolbox is class p-tb...but i can't find that class in my
main.css...
i even wrote that class...but it doesn't work...seems the style is
configuered some where else...or something else....

thanks for help jule