Rounded Border for Mega Menu

[trickywiki]

Hi,
I'm upgrading my site from V9 to V11, using the Silver theme, mainly for rounded borders and then I've added Mega Menu.
I've managed to get the colour of the Mega Menu to match the Silver Nav Bar but I can't work out how to get the rounded corners?
Any assistance in pointing me in the right direction would be appreciated.
Thanks

[trickywiki]

Hi,

Is it best to use background positioning i.e. copy the nav bar approach or to use the css rounded border approach?

Cheers