I'm trying to give a div (position: fixed) the width of 100% (relating to it's parent div). But I've got some problems...
The first problem is sovled by using inherit, but it still doesn't work. I think the problem is that I'm using multiple divs that take the 100%/inherit width.
You can find the second problem on the jsfiddle update: http://jsfiddle.net/4bGqF/7/
I´m not sure as to what the second problem is (based on your edit), but if you apply
width:inherit to all inner divs, it works: http://jsfiddle.net/4bGqF/9/