JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main"></div>

CSS

#main {
    background-image: url(/img/initializing.png);
    background-size: 200px 200px;
    height: 400px;
    width: 400px;
    background-position: center center;
}

JavaScript

document.getElementById("main").style.backgroundSize = "100px 100px";