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 17 02 pm](https://f.cloud.github.com/assets/24193/705771/aba619fa-dddc-11e2-85b8-2df08ee3035b.png)