Change aspect ratio of gallery

Hi,

I have two images in a grid gallery. However, because squarespace puts them into containers with pre-defined aspect ratios, my css shadows look offset and the images don't align to site margins, particularly on mobile.  If I can manually change the aspect ratio of the containers using css, this should fix it, but I can't seem to figure out if this is possible or where I would change it.

I'm using York, and here's the page I'm testing it on

Any ideas? Thanks!

Did you find a solution to this?  Just posted about it myself!