Intro component with signup form (used SCSS and Vanilla JS) Newbie

This is my version of Intro Component with Signup Form (https://www.frontendmentor.io/challenges/intro-component-with-signup-form-5cf91bd49edda32581d28fd1) newbie project. The area of which I'm not unsure is definitely the JavaScript part, so please provide a feedback of pros and cons of my way. Also, I have a quesstion about best practices with sass, should I have made different files for variables and globals for this project, or was it enough to put it all under one main sass file.