Gallery section isn't fitting to mobile screen. (how to get rid of horizontal scroll)

Site URL: https://rolling-pictures.squarespace.com/about-us

The "about us" gallery images shows 2 images at a time on mobile, but for some reason it's getting cut off and expanding the page horizontally which is causing a horizontal scroll (which I don't want). How do I fix this issue?

Password: hello

And not sure why but that one "LINKEDIN" button is very close to that one image and I don't know why it's doing that.

Any suggestions?