Fixing blank switch buttons on small screens

This is an attempt to restyle the switch styles on a small screen.
The old styling caused the button to disappear, this brings it back
and makes it full screen width.

This is what it looked like before:
<img src="https://cloud.githubusercontent.com/assets/545898/2786910/7a87e898-cb80-11e3-8ea4-abb14c86b64a.png" width="250">

With style changes:
<img src="https://cloud.githubusercontent.com/assets/545898/2786911/7a8835d2-cb80-11e3-802a-1b514f48886e.png" width="250">