Fluid into Fixed

[dadoc]

Hello,

I have the latest vB 4.1.11 and have done some edits to the colour of the forum, it comes standard as a fluid style can I change it to fixed width?

[Adam H]

<a href="https://www.youtube.com/watch?v=2KpudtxR_KA" target="_blank">http://www.youtube.com/watch?v=2KpudtxR_KA</a>