Background colour for outbrains component

### Before

![screen shot 2014-11-14 at 17 06 39](https://cloud.githubusercontent.com/assets/74132/5049832/b07b5e94-6c20-11e4-87e5-e62f8e3e67a8.png)

### After

![screen shot 2014-11-14 at 17 07 05](https://cloud.githubusercontent.com/assets/74132/5049839/b583284a-6c20-11e4-8593-ce0efa20a7a1.png)