Margin/spacing between Grid Row elements

Hi,

I can’t seem to get any margin spacing between my grid row elements. I’m trying to create page styling that groups clusters of information together in different sized boxes (like the Google+ grid layout). I can add a class to the grid elements and add a border fine, but can’t seem to change the margin/spacing between the elements this way. How might I do this?

Not sure if this is a feature in the works or at all possible, but it would be super amazing to be able to add custom classes or ID’s to the normal layout elements as well!

Any help would be great. Thank you!