Non GP specific CSS request

Hello,
I'm trying to align columns to have the same margins (0px). It's fine on a smaller screen, but on a medium I get something like this:
IMAGE

My gutenberg blocks looks like that:
IMAGE

My CSS for these columns is:

.wp-block-columns {
	margin: 20px 0 20px 0;
	display: block;
	font-size: 15px;
}

.wp-block-column {
    margin: 20px 0 20px 0;
}

Removing display: block; solves the problem but then columns break much later (on smaller screens), which is not ideal.