fix CSS

Before:

![screenshot from 2014-04-29 14 48 06](https://cloud.githubusercontent.com/assets/3072779/2829602/16c24208-cfa5-11e3-9b9c-0e185b1ad3bd.png)

After:

![screenshot from 2014-04-29 14 46 21](https://cloud.githubusercontent.com/assets/3072779/2829603/1c96f0b6-cfa5-11e3-89bf-b88be6e35d4a.png)