JSFiddle - React, Tailwind, and code Playground

HTML

<div id="demo"></div>

CSS

#demo {
background-color: pink;
height: 50px;
width: 100px;
}

JavaScript

demo = document.getElementById("demo");
demo.addEventListener("mousemove", function() {
    demo.style.backgroundColor = "red";
    });
demo.addEventListener("mouseout", function() {
    demo.style.backgroundColor = "pink";
    });