Container top borders always full width

Before:
![screen shot 2014-09-26 at 13 33 43](https://cloud.githubusercontent.com/assets/813383/4420459/71be6110-4579-11e4-8c91-e3ef7de95361.png)

After:
![screen shot 2014-09-26 at 13 33 22](https://cloud.githubusercontent.com/assets/813383/4420462/7855ee9e-4579-11e4-841c-e047d6066b1d.png)