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u can actually change all the css and templates of ipbm in the ipb adminCP where it says skins & templates.. u can see every bit of CSS value.. any changes to that should be visible immediately after refreshing your board.. as for which 1 to edit i'm not sure.. i'll go thru it later, but if u set xbb common settings to Not wrap the ipb board inside XOOPS then you shouldn't have that problem at all, as ipb itself stretches to the screen width.. providing ur using the default skins..