Change width of catch box pro theme vs change to Evolution

Hi, I figured out how to display a page larger that 1100 pixels, but only for one css type - pages with no sidebar - using the following: /* Makes Pages With No Sidebar Wider*/ .no-sidebar.full-width #page { max-width: 85%; width: 100%; } Can you please tell me how to format it for other page types so I can enlarge width at will? Previous answers sometimes were just "buy evolution, it's made for it" I tried evolution, bought it for my girlfriend - but my header background was messed up, the widgets aren't curved the same, I like my catch box pro :) and want to keep it. I don't want to rehaul my entire theme by switching from catchbox pro to evolution pro if I don't have to...... Can you help me? Thank you