Interactive rating component

I did this project to certify my knowledge in the bases technologies of frontEnd, without any framework, just with HTML, CSS, and JS.

With the CSS I had a problem, centering the DIV in the middle of the screen using flex-box properties just with CSS without Bootstrap, so if anyone knows how to make this work, I'll appreciate it. I think my HTML is not that clean, so is something to upgrade, I'll be trying to make this better with time and learning, but I'm accepting advice about it.

I chose to make the backend of this project with only JS, but further, I'll try to use more Jquery and Reactive, and I'm sure that some functions can be cleaner and more practical, so I'll work on it.

This challenge had a mobile version, but I don't have knowledge of it, so I did just the Web part.