[SOLVED] Rounded corners in page menu bar

I've skipped through various pages but couldn't find the solution to my "problem".

I'm muddling my way through customizing the layout and it's going good so far.

I am wondering, however, if there was a way to give the page menu bar rounded corners?

There is a bit of code for the overall page that I used to give the entries etc. rounded corners but I have no clue where to put it if i want to fiddle with the menu bar.

Any hint is appreciated and I appologize if I missed a post focusing on the same issue.

Thanks in advance.