Fixed header background on large screens

Hey,
On large screen there is an issue with header background. I'm attaching screenshots before and after my fix. Hope you like it.

Best regards,
Oskar
![before](https://cloud.githubusercontent.com/assets/5034850/4034972/6af91166-2c8a-11e4-974c-57d1c8160530.png)
![Uploading after.png . . .]()


I was thinking about technique#2 but do you care so much about IE8/9? I am not sure if so many devs are using legacy browsers :P