Remove the float, reduce the margin

Discovered diring deploy of Freebird, see: https://github.com/GigaOM/legacy-pro/issues/4192

The form wrapper was floated, and this caused the header below to stretch all the way up - the little bars are actually the top border of the bottom header:
![screen shot 2014-10-29 at 2 05 50 pm](https://cloud.githubusercontent.com/assets/929375/4831696/8fd6a20c-5f96-11e4-9fa3-e48897227359.png)
![screen shot 2014-10-29 at 2 06 02 pm](https://cloud.githubusercontent.com/assets/929375/4831697/8fddff34-5f96-11e4-870a-5023c6ddcfed.png)

margin was reduced because it was pushing the bottom header down too low - off the colorbox.