Tweak styles to work better on B2G

Fixes #77 

Before:

![screen shot 2013-06-25 at 4 15 50 pm](https://f.cloud.github.com/assets/24193/705770/a66db0e2-dddc-11e2-84aa-f795ab47313f.png)

After:

![screen shot 2013-06-25 at 4 23 15 pm](https://f.cloud.github.com/assets/24193/705800/86a1b50a-dddd-11e2-9128-cdf9d11e6078.png)