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/80089/5008955/8b074c18-6a59-11e4-92ac-bcbe28dbf038.png)