How to make navigation wider in twenty eleven theme

Is this the easiest way to extend the width of the navigation?
https://www.coolestguyplanet.net/extend-the-twenty-eleven-theme-menu-navigation-to-fullscreen/

This is the site I am working on
https://www.broomecircle.org.au/

I have actually left off part of the names of these pages to make more room .. they are actually meant to read Kimberley Money Management and Broome Volunteer Resource Service, etc.

Is there a classier way of doing this other than making the text really really small.

Using child theme of twenty eleven.

Thanks!