Change page navigation colors?

I have been researching this problem for awhile now and have had no luck! I am trying to change my top navigation menu (home, about, contact, etc.). Instead of having the bottom pink line, I would like to have the whole page name highlighted.

My website:
http://www.crazyforsavings.com

Examples of what I’m looking to do:
http://forthemommas.com/
http://moneysavingmom.com/

Thank you!