vanilla javascript, mortgage calculator

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

I'm proud that I at least finished the project, even though the code source requires some refinement

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

When trying to put that fixed text inside the input, I faced the real first hurdle in the project, after that comes all the validation steps in javascript. With a lot of research, I finally, somehow made it works

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

I'm requesting feedback from all of you fellow learners on how to better structure my code, whether it's css or javascript