Meet Landing Page - How to make it better responsive?

Hello everyone! 👋

I finished another challenge! 🎉

It was a lot of fun, even though (or maybe because) they get a little more challenging 💪

Questions

1. I have a hard time not using fixed widths and heights. I tried different ways (min- and max- and % and vw and rem). Can anybody give me some good pointers please?

2. The 4 squarish images look good in FireFox, but not in Chrome (too big and the outer one are cut off). Can anybody tell me why that is?

Thank you very much for any support you can give me. I have been self-learing HTML and CSS since May 2021 and I want to become a developer, so any constructive criticism is very welcome. 😊

Have a nice day! 🙋‍♂️

Update: I fixed my second problem with the help of the Frontend Mentor Community on Slack 🙏 and am learning to understand how to fix the first one.