Some help please…

I am trying to accomplish a few would be simple things with the CSS but am falling down each time I try.
my site – https://www.atmasphere.net/wp
I’d like to lock everything within the rap, which I though I would do by setting the width, but as you will see the page can float out pretty wide…
I would also like to create a nested list for my links and have different sizes for the titles of the categories than for the links themselves. I can’t get these to nest or change sizes.
Related to this last one, is there a way to order the list categories? right now they are in the numeric list from the table within the controls
Thanks!