Fix shipping instructions style.

Shipping instructions doesn't look very good due to the way floating is handled.

![shipping-instructions-before](https://f.cloud.github.com/assets/764390/340299/6e3eafbc-9d4c-11e2-987c-8e279e15115a.png)

now looks like:

![shipping-instructions-after](https://f.cloud.github.com/assets/764390/340297/5b8eaea8-9d4c-11e2-956e-9bd53fee7f11.png)