Responsive newsletter sign up form using HTML, CSS, and JavaScript

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

I am most proud of being able to toggle between the newsletter ui and the success message ui.

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

I had a difficult time figuring out how to display a different image on smaller screen sizes but after a lot of googling I figured something out.

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

Any feedback at all will be greatly appreciated :)