2.0.11 colour

[starck]

Hi there,
My forum hxxp:linkremoved.com [nonactive] is running on Core 2.0.11 with many add ons other themes can't handle.
Love the many features it have, and have made some changes myself.
But... Do any of you know how to change the background colour, not in forum itselve, but at side/top/buttom at the style sheet?
Any reply will be rewarded with a free membership! LOL It's free anyway!

[edit] link removed due to adult content -Illori

[Kindred]

firefox+firebug is your friend...

Also, do you mean the actual core theme or do you mean the default/curve theme?
because the core theme is seriously outdated and will have issues with many mods. Mods are always designed to work with the Curve theme