Remove fixed height on div. [ci skip]

Before:
![image](https://cloud.githubusercontent.com/assets/5796310/4758842/99c1b9e0-5ae2-11e4-8b1e-981886050f49.png)

After:
![image](https://cloud.githubusercontent.com/assets/5796310/4758828/7691b6d2-5ae2-11e4-9bb0-bd6d0c6e05db.png)