left:10%; top:5%; right:10%; height:90%; width:80%;
Then there is a banner that's 200 pixels tall and the same width across the top.
Right now, there isn't a menu, but it will be approx 10%-20% of the size of the main box, on the left edge.
And I want, finally, a text box, taking up the rest of the space. But how do I make it so it scrolls through text? Like, so no matter how much text, it only takes up that amount of space.