Tip calculator app (vanilla-js)

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

This is my first web app.

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

I struggled to make the calculator work as the necessary values are inputted. I used the onchange event listener to make the calculations as certain values were input.

input.addEventListener("change", () => {}

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

I would like to know if there is any way i can make my code cleaner and more efficient.

Any and all feedback is also welcome. Thanks.