Fix layout of most popular galleries container

I broke this with the super branch yesterday.

### Before
![google chrome](https://cloud.githubusercontent.com/assets/80089/5008952/85eed2c8-6a59-11e4-980d-9e7636d84c12.png)

### After
![google chrome](https://cloud.githubusercontent.com/assets/80089/5009289/52ea0650-6a5d-11e4-9d85-d4fab36fc7f6.png)