how can i reduce forum width....

[hariprasad]

Where and what (template) should i edit to decrease the forum width...
After installing sidebar i need to scroll rightward to see the forum content....to avoid this we need to reduce forum width....
i am using colortheory style....

here is the screenshot:
http://img187.imageshack.us/img187/9544/vbtteh1.jpg

or see attachment.....

Pls help......

 

[TsuQi]

admincp > style manager > stylevar > set ..... %

 

[hariprasad]

TsuQi thank you very much.......
but tat dint solved my problem....