[tbworld]

Not sure exactly what you are looking for, and I did not have much time to get into it, but maybe this will help.

Play around with these settings in your CSS:

I added "!important" just so it worked on my end. You should always try to eliminate the use of "!important" -- so remove it where you can. It might cause you problems at a later date, when you install a MOD trying to override the CSS.

#overcaloscsec {
   margin: 0 auto !important;
   min-width: 960px !important;  /* This was set to high */
   padding: 0 !important;
   width: auto !important;
}

Nice job providing us everything we needed to assist you.