Improve error screens look and feel 905368

From this:

![web_pay](https://f.cloud.github.com/assets/1514/965086/9f2f3d82-0523-11e3-9c08-f3b4746c7891.png)

To this:

![web_pay 2](https://f.cloud.github.com/assets/1514/965088/a59a3ca8-0523-11e3-8c78-4c8676aef63b.png)