Newsletter Sign Up Form (HTML + CSS + Javascript)

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

I'm happy i can get the styling as close to the design including the mobile design. I was able to make this using single page HTML. making the form validation was also pretty easy.

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

I was thinking about whether to make this as a single page or make another page for success message. but i decided to make it single page by changing the form and success message display on CSS.

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

I wonder if you can use backend like php to display the success message and how to do it.