Right now, the header and the menus areas go across the fill width of the window. I would like to change it so that they have the same margins as the body content and I can put a border around it all. I want it to end up looking like this:
You can see that you can adjust that padding to make the outline further out or closer in to your content. Leave your margin setting as it is shown, because that ensures it centers the content. Anything else is adjustable!