Probably something simple, but i'd like some advice please.

[wrestlepower]

Hi, on my forums, the different forums are displayed with different width, as are different posts. I've included some images to try to highlight my point. Is there any way i can get them to a uniform width? I've had a look about in the styles menu and i cant seem to find it.





Is this a setting, or combination of settings, i can amend myself?

Thanks in advance for any feedback.