Issue 9: Fixes color gradient overlap problem on top of page

Hi Austin,

Issue 9: Fixes problem where color gradient overlaps the top of the working application area, hiding/obscuring the text at the top of the page.

https://github.com/LumaPictures/meteor-luma-ui/issues/9

Modification moves the top of the application working area down by 12px so that the top part of the working area starts below the gradient.

Regards

Rudolf