Forum width messed up after template modification

Technical Details

Forum version : #phpBB2
Position : Founder
Concerned browser(s) : Mozilla Firefox, Google Chrome, Other
Screenshot of problem : https://i.imgur.com/98ELbCU.png
Who the problem concerns : All members
When the problem appeared : After messing up a template yesterday; I have tried to change something, I like to modify the templates, but I can't reverse it back.
Forum link : http://swchildrenoftheforce.hungarianforum.com/

Description of problem

Hey guys. I have a serious problem. I have messed up a design I have been working on for a loooong time and I don't know what to do about it now.

I like trying new things with the templates, I didn't have any problems with them until now. I usually make small changes with them that I can't do with CSS. Yesterday I tried to move a few things to other places in CSS, when the most terrible thing I could imagine have happened.

Like I usually do, I made a new backup save from the template, just in case, then reversed back the original template. Then everything went crazy, my forum messed up, no matter what I did.

After a few hours of agonizing and crying, I was able to achieve as much as you can see on the image and the link. Whenever I try to do even the smallest change in some of the templates (the ones that affect the main board), my forum messes up - again. Now I have deleted every one of the modified templates (ofc I have backups for them), but it is still not okay. As you can see on the image, the main problem is the width of the forum. I can't shrink it, I am not able to make is small enough to fit the background image.

I have also made a test forum, I installed the same skin and CSS codes, and even some of the templates. It works just fine there: http://clefairy.hungarianforum.com/
But not on the main forum.

Another thing: I have tried to install a random other phpbb2 skin. The same problem occurred, the width of the forum is too much...

Please, help me, I don't know what the problem is.

Since no solution was provided:

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