Comixology digital comics reader: how to hide the control bar?

I'm reading some comics with the Comixology's browser-based comic reader, but the little toolbar at the bottom keeps popping up whenever the mouse is moved and not idle for several seconds. It gets in the way of text/dialogue near the bottom of the page, so I have to sit and wait for the thing to disappear when I get near the bottom. Is there any way I can hide this bar permanently? I have absolutely no use for it, since I'm using the keyboard to control the pages, and the mouse to zoom in and drag the page. I really don't need those little buttons anywhere.