cottoncashmerecathair

I snapped another shot of your website to make sure I understand what you're asking.
In the image below, the GREEN rectangle represents the padding. As shown it's 17px on all sides.

 
In this next image, I removed the padding on the bottom. Is that what you're trying to do?

If so, this custom CSS should remove the bottom padding:
 
.sqs-block-gallery { padding-bottom: 0 !important; }