Clear elements to enforce correct columning when using float fallback

### Before

![screen shot 2014-06-05 at 16 01 34](https://cloud.githubusercontent.com/assets/85783/3189283/55048474-ecc2-11e3-8e68-f73942d77832.PNG)

## After

![screen shot 2014-06-05 at 16 02 05](https://cloud.githubusercontent.com/assets/85783/3189287/64f0e5da-ecc2-11e3-8061-48f3ffdd241a.PNG)

![ ](http://media0.giphy.com/media/3FNCFXeaVSwEM/200.gif)