fix banner on landing page

-removed overflow hidden in order to fix banner on landing page

**before** 
![before](https://cloud.githubusercontent.com/assets/884833/5158062/bd6ef5ea-7330-11e4-9120-8a0f15f36444.jpg)

**after**
![after](https://cloud.githubusercontent.com/assets/884833/5158070/f10f8bee-7330-11e4-993a-8e31fc2c2596.jpg)