Centering the navigation/pimary-menu of twenty fourteen

Hello everybody,
I’m searching for a simple solution to center the navigation of twenty fourteen, which is floated to the right by default.
There weren’t any solutions that worked for me yet and I’m sorry if this problem was already solved.

The only thing I added to the original css is to center the page by the use of ‘margin 0 auto;’.
Now it would be great if the navigation text (not the search field) would appear centered too: krossfire.net

Thank You!