JSFiddle - React, Tailwind, and code Playground

HTML

<div id="element">Click</div>

CSS

#element{
    height:50px;
    width:150px;
    background-color:#333;
    border: 1px solid #ccc;
    color: #ddd;
    text-align:center;
    cursor:pointer;
}

JavaScript

function doSomething(){
    this.style.backgroundColor = "#00ff00"
    this.style.color= "#000000"
    console.log(this);
}
document.getElementById("element").onclick = doSomething;