JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo">click me</div>

CSS

#foo {
    background-color: blue;
    height: 50px;
    width: 50px;
}

JavaScript

var div = document.getElementById('foo');

div.addEventListener('click', function(){
    this.style.height = 100 + 'px';
    this.style.width = 100 + 'px';
    this.style.backgroundColor = 'yellow';
});