Padding Between Image Blocks

I'm looking for the CSS code to control the padding between image blocks (or possibly between all blocks).

I've tried combinations of these with margin or padding, and nothing changes.

.sqs-block.image-block { margin-top: 100px !important; padding-bottom: 100px !important; }

Thanks.

I figured it out... it seems that so far I've been answering all my own questions :).