Responsive Newsletter with light JS

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

Getting the javascript to work for the different responsive elements.

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

Not too many really, there was a bit of back and forth between the different css between desktop and mobile, but this is because i created some of the js for desktop before mobile, so meant i backtracked a little bit.

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

HTML semantics and structure css structure and conciseness/best practices JS structure and general feedback