Menu bar is vertical instead of horizontal

I have no idea how my menu bar is vertical instead of horizontal like I had it before. (I have been trying to make all kinds of CSS changes for media queries to work so that might have changed something, but I can’t figure out how to switch it back.)

My website is http://www.localgreeneats.com

The menu buttons are fixed below the home button. Instead I would like for them to be on the green bar.

Thanks