Tip Calculator with CSS-Grid and Vanilla JS & MVC Concept

Hey people, I'm so proud to present my ever first challenge on Frontend Mentor! With this project I've been challenging myself on two topics that are kind of new to me, which are CSS-Grid and the MVC Concept (with Vanilla JavaScript).

Though you wouldn't probably use MVC on a little project like this, it helped a lot to dive into the concept of jumping back and forth between the files.

I would love to get your opinions on this! Especially I'd be grateful for any suggestions on how the interaction of the buttons and the custom-Input Element could be improved.