Is there a way to position two divs on a page without hard coding margins or padding? One div has fixed positioning at the top of the page with style="position:fixed; left:0; top:0;right:0;", and the other has fixed positioning to the left of the page with style="position:fixed; left:0; top:0;bottom:0;". Can the left div be positioned so its top edge lines up with the bottom edge of the top positioned div without overlaps?