Tip Calculator App

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

I am proud of solving the select tip section and the custom input field.

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

I was struggling with the custom input, it is resolved with position: absolute.

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

Any input would be appreciated but primarily on Javascript. How can I improve my index.js, also if you find any error.