Simple Responsive Centered Nav Menu Bar

I’m trying to create a responsive nav bar with the cleanest code possible.
I can’t seem to get the code to work right.

working example:
http://www.22squared.com/

desired example:
http://beta.fugostudios.com/wp-content/uploads/2014/03/Screen-Shot-2014-03-26-at-5.00.05-PM.png

current state:
http://beta.fugostudios.com/home/