I want to have 2 boxes right next to each other, one with a fixed width, and another with a width that will change based on the size of the browser. The box has overflow:auto, and I'm trying to get the first box to act as a side bar that will follow you down the page. But of course I can't seem to achieve this, and have come here hoping someone could give me some examples, or point me in the right direction.

Thanks!