I have just started to create my own website with help following the lynda.com tutorials on setting a website up in Dreamweaver.

I have come to a point where I can't seem to create a box with a border radius or a transparent effect even though I have clearly set them up in properties.
As you can see from the screenshots the header 'about us' is in a div and I have set the CSS properties to allow for border-radius and a transparent tint effect both which are not present when viewing in live view

What am I doing wrong?

design view : http://gyazo.com/06fba411842367e859dd9af3535373dc
live view : http://gyazo.com/5b297d15109466cd1e5ac88b7bcbad3d