[Support request] Margin around posts

Hey guys,

I’m having difficulty pinpointing where margin on my WP Show Posts is coming from. I would like to add box-shadows on hover but the box-shadows are not around the actual post cards but rather around the extra margins. The margins only exist on the top and left side of each card.

Here’s a link: https://swinetechnologies.com/

The WP Show Posts are closer to the bottom.

Thanks!