Round the corners of my header?

Hello,

I am wondering if it is possible to round the corners of my header? I have the code in the custom CSS section, but it doesn't seem to affect anything. Any thoughts? I'd love to add a drop shadow as well.

Hi there Logan, your site looks great and I was trying to do a similar thing with mine. The one difference is that mine had drop-downs in the folders. The "overflow: hidden;" command seems to make the round ends possible, but also hides my drop-downs. Do you or anyone know how to get around this?