Basic DOM manipulation for creating simple newsletter form

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

My understanding of dom manipulation has increased after doing this, such as entering email values ​​into success cards and also how to create validation email forms

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

how to efficiently using css styling, there are still lots of redundant styling in my css file. also the validation email was quite difficult, still wanna learn how to validate input email using regex not just using build in function like checkValidity().

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

n/a.