Fix video styling issue with top border at top of news container

From this

![screen shot 2014-08-08 at 11 15 51](https://cloud.githubusercontent.com/assets/1001642/3855452/428d8f2a-1ee5-11e4-9211-26ccb43099aa.png)

to this

![screen shot 2014-08-08 at 11 16 01](https://cloud.githubusercontent.com/assets/1001642/3855459/545f0954-1ee5-11e4-8b69-dc57673bb321.png)

This rule should probably go in `_news.scss`.