Lightweigth Grid Columns - Margin bug?

Hi Tom,

First: thanks for being awesome!

Second: I'm using your lightweight grid columns plugin with GP.
I am trying to remove the margin-bottom 1,5em from .lgc-column

Since I want it only removed from a particular instance of a column and not globally for ALL columns on my site, I use the following shortcode:

[lgc_column grid="50" tablet_grid="50" mobile_grid="100" last="false" style="padding:1px; margin-bottom:0px;"]

However, the margin-bottom is still there. I also tried margin-bottom:0em; - with identical results...

Any idea what might be happening here? Is there a bug in the plugin that it won't take the margin parameter, or am I doing something wrong in the shortcode? (the padding parameter is working just fine)