Responsive newsletter signup form using vanilla JavaScript

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

I'm generally happy with how this turned out but definitely could have done a better job of planning the layout and shared styles from the beginning better.

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

The custom form validation took a minute to figure out but a little trial and error and some vanilla JavaScript was all I needed. Getting the button to transition properly (I always forget you can't transition a gradient background) took some quick research. Luckily, Keith Grant has a good solution (linked in my readme).

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

I'm hoping I managed to preserve accessibility requirements with my custom form validation, so any feedback in that regard and for the design in general is always appreciated.