The header and the other area are fixed at 1155px. Maybe you could make the header a background that repeats along X at the top and try another, lighter background color for the body. I tried setting the sections you wanted to be full-width to 100%, but there’s some conflict causing them to collapse. Sorry I can’t help more, the code it pretty cryptic WYSIWYG stuff and makes it hard to trace where issues are.
Yeah I agree Boogie, I’m only using Adobe Muse because I’m not to the point where I could code a website myself. I have learned a great deal in the last couple days trying to get this thing to go full screen. But, it makes me feel some what better that it’s not as easy as I thought it would be. So I can have a separate background for the header and the body? I even made a full length pattern that repeated its self along x. The only issue was that when the checkout is there it’s dynamic and moves according to what options people need etc.