6
Well, all your widths are coded in your theme.html, and not your style.css.
The main Taqble is set to 850px. I can see that your left column is set to 179px, the center column is 470px when rightcolumn is set to show and 690px when no rightcolumn will show. The rightcolumn itself is set at 200px.
NOTE: All your images are set to specific sizes, so changing width values may screw up the overall look due to the images not fitting right. This theme is very difficult to play around with.
You should change the 903px and 850px to match the total width wanted. And change the 470px and 690px to 100% also. This way they should make the center column fit the content. However, like I said higher up, you'll probably need to play with the images also.
Those are the basic numberes to play around with.
Cheers.
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