dkret3 too many links for a single line navigation bar

I have added enough pages to my site that the navigation links have extended to two lines, but the green area remains a single line. I’d like all of the navigation area to be green, like this site I found here on support: http://www.LondonderryNH.net.

I have searched the forums and spent a long time trying to figure out how to accomplish this. Is there a simple way to fix this that I’ve overlooked, or is this a more complicated process? I’m not very experienced and don’t have much technical knowledge.

I’ve included a link to my site, as well: http://ridechickens.com/

I thank you in advance for any help!

http://wordpress.org/extend/themes/dkret3/