How to make a transparent background without background image?

Question

I would like a div to have a transparent background.
I tried to do this using background-color and opacity, but the problem is t

Answer 1

If you just want the color of the background to be transparent and not the child content, use

background-color: rgba(0,0,0,.5); // Sets to 50% transparent

See this page for more details - it's a css3 spec so won't show up in every browser:

http://www.css3.info/introduction-opacity-rgba/