Responsive Newsletter with vanilla JS (click and keydown-event)

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

I am proud of working with regex successfully, the JS in general and overall how it turned out. I believe I could simplyfly my css better and adding some animation for the transition.

What challenges did you encounter, and how did you overcome them?

I believe the most challenging part was the display section when clicking on the buttons

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

I read the "Managing forms with JS" on the Learning Path before. And it would help me if someone explain to me how to use it on this project.

And any kind of feedback is welcome!