Mobile padding of multiple images inside one image block

Site URL: https://roadrunner-elephant-4rfm.squarespace.com/

I'm looking to change the padding between images inside the same image block. 

password: elephant

With CSS I managed to get the padding right for my image block galleries (site wide).  Now I can control the height of an image, combine blocks stacked and side by side, and the page converts nicely on mobile.

It would be perfect if I can also get the same padding for multiple images in the same image block because it's still easier than adding a new block for each. 

https://roadrunner-elephant-4rfm.squarespace.com/work/music-on

Last block has multiple images and you see the space is larger :)

Same here. Did you solve?

Nope. I tried finding a class that the image itself responds to, but no luck yet.