Reduce vid container width to avoid black line

Heya!

Prior to this change there is a black line on the right hand side of the
video with Firefox 31.2.0 on Debian Jessie

I've only Linux boxes here, so I'm unable to tell is this problem
persists across other OSes, or if I've introduced any other problems
with this tweak.

Screenshots!

Before:
![reevoo-before](https://cloud.githubusercontent.com/assets/6134406/5112774/2003bf04-7022-11e4-972d-b9369594671a.png)

After:
![reevoo-after](https://cloud.githubusercontent.com/assets/6134406/5112775/2005fba2-7022-11e4-81c1-48d70926513b.png)

Cheers,
Louis