Responsive landing page using CSS flexbox

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

I am the most proud of how quickly I figured out calculation part in JavaScript. But I should admit that the code is a bit lengthy, and I want to try to make it more simple next time.

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

This can sound a basic rookie mistake though, there was a typo for "addEventListener" and I kept receiving uncaught type error. I took quite a time to figure out it as this time I disabled copilot. It makes me realize how dependent I've been on those extensions.

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

If anyone can suggest a better code for JavaScript part, I would love to hear how it can be improved.