Chat App CSS Illustration

What are you most proud of, and what would you do differently next time?

I'm happy I finished this project. I found it quite challenging.

What specific areas of your project would you like help with?

I have problems with responsivity. Some elements look funky when screen size changes. For some reasons there is space at the bottom and right side. I'm not sure if it is causing by the pseudo element that I used for background design. Can elements with position: absolute: cause overflow?

I would appreciate help with the hero. I think it was only decorative, but for practice I gave it input and button elements.

And my biggest challenge was to keep the size of phone in the design to small, but I think I failed terribly since it is big and causing overflow vertically. I still don't know what is causing horizontal overflow. Please help me understand that!