Center Main Navigation

Hello,

I’m trying to center the main navigation of this site:

http://chinagardendahlgren.com

The menu was centered, but after several updates*, it shifted left, and I can’t seem to figure out what CSS is acting on it to move it left. I’ve tried playing with several things in Chrome Developer Tools, but nothing seems to move it to the center.

(*This site isn’t updated very often – I know, SHAME ON ME! – so I ran a lot of updates all at once. Everything else is ok, so I’d rather not roll everything back just for what seems to be a simple CSS fix. Honestly think it’s just something I’ve missed.)

Thanks in advance for the help! 🙂

The page I need help with: [log in to see the link]