Fix margin

Some stuff looked weird on https://gocardless.com/paying-through-gocardless

@jamesshedden this ok?

**Before**

![screen shot 2014-07-15 at 12 39 54](https://cloud.githubusercontent.com/assets/1756669/3584185/3a4f69d8-0c15-11e4-8435-8406421482cd.png)

**After**

![image](https://cloud.githubusercontent.com/assets/1756669/3584187/42ca2530-0c15-11e4-877e-3cba603589b2.png)