Fix footer resizing on small viewport

Fixes #222

Untested but finger crossed? Manually changed the CSS live

before: 
![screenshot 2014-09-05 11 14 19](https://cloud.githubusercontent.com/assets/1909539/4166987/62db94b2-350f-11e4-996b-ec843a3ce35b.png)

after: 
![screenshot 2014-09-05 11 14 13](https://cloud.githubusercontent.com/assets/1909539/4166988/6683f7a8-350f-11e4-9e71-7afe810db9d6.png)