This background color should only be applied on non-anonymous pages, otherwise we can get display issues on skinned tenants.

![screen shot 2014-04-30 at 13 16 31](https://cloud.githubusercontent.com/assets/109850/2841057/6b5149ba-d061-11e3-89df-d6b39dd50bc6.png)

We can use `.anon` for this.