Remove width from columns container

For non-column browsers, width was spurious

## Before

![guss-naughty](https://f.cloud.github.com/assets/74132/2159245/32ed2766-94a1-11e3-90b2-30e4c540b0d6.jpg)

## After

![guss-good-boy](https://f.cloud.github.com/assets/74132/2159246/378af1c2-94a1-11e3-9d86-5fc1d4b47843.jpg)