How do I center the navbar in gridmarket a child of framemarket?

First of all my site is flyinggoatfarm.com and yes it takes a bit of effort to get the FAA to approve goats to fly. I have been searching the web for days to find a way to center the menu bar (Home Posts About Us Contact Us) I have installed the Simple Custom CSS plugin and tried several different web based suggestions but the menu bar hasn't bugged :slight_frown:
I'm hoping that someone with a lot more experience can point out the failures in my attempts or even better show me a way to do this in a totally different way.
At any rate let goats fly!
Thanks in advance,
BC