Desktop styles for Header and Navigation in internal pages

![screen shot 2014-08-08 at 3 58 24 pm](https://cloud.githubusercontent.com/assets/662225/3862051/64951aba-1f36-11e4-8f33-9b20253107a1.png)

I don't love DMB, but can never read this without singing https://www.youtube.com/watch?v=H67uEgRZs2Y