[Support request] Flex box height for posts columns

Hi guys

Hoping you can help, is there a way of setting up some CSS with flex box so that the height of the post column matches across a list with 3 columns/posts regardless of the length of the excerpt being used? I’m using a custom class on the list to create my own cards style for the posts, but as soon as there’s some variation in excerpt length the mismatch of column heights ruins the look a bit.

Thanks for any help
Greg