Post cards: force image to go fill the height

<img width="711" alt="Screenshot 2021-02-13 at 18 06 05" src="https://user-images.githubusercontent.com/1083581/107856085-25632800-6e26-11eb-8211-fa23010388ae.png">


At the moment, the image has a fixed ratio — what if there was an empty/translarent element that pushed the card instead of the image, and the image would be instead position absolute / 100% of that side of the card?