JSFiddle - React, Tailwind, and code Playground

by Alexey Mishin

HTML

<div class="block"></div>

CSS

.block {
  width: 200px;
  height: 200px;
  margin: 0 auto;
  background-color: black;
}

JavaScript

var block = document.getElementsByClassName('block')[0];

const makeRandInt = () => Math.floor(Math.random() * 255);

block.style.backgroundColor = `rgba(${makeRandInt()}, ${makeRandInt()}, ${makeRandInt()}`;