Fixed width forum

[MikeH2911]

Hi,

I need to create a fixed width forum of 900px so I can wrap some styling around it. The styling involves setting a 900px by 4px image in repeat-x behind the forum. I've tried and failed to get this consistently working, I keep finding sections of the forum which don't have it displaying and where parts of the theme are bigger than 900px.

Surely there must be a single thing to change to achieve this rather than lots of things?

Any help is greatly appreciated, I'm using 3.8.4

Cheers

Mike

[Seven Skins]

A link to your forum would be helpful in identifying the error.

[MikeH2911]

Forum isn't live yet, screen shot of what I'm talking about is attached. I've found that if I put the background image in the spacer template I can get it to fill this gap, but it runs too far from top to bottom.

So what I need to know is how to put a repeat-x image of fixed width behind the post in the image. What template am I looking for, I'd have though showpost/showthread was where to look but it doesn't seem to help.