JSFiddle - React, Tailwind, and code Playground

HTML

<button id="button">click me</button>

JavaScript

var button = document.getElementById("button");

var rainbow = ["red", "orange", "green", "blue", "indigo", "violet"];

function change() {
    "use strict";

    document.body.style.background = rainbow[Math.floor(7 * Math.random())];
}

button.addEventListener("click", change);