JSFiddle - React, Tailwind, and code Playground

by Town

HTML

<div class="red">
</div>

CSS

div { height: 500px; width: 500px; background-image: url(http://www.christownsend.com/images/superdog.jpg); background-repeat: no-repeat;}

.red {background-color: red;}
.blue {background-color: blue;}

JavaScript

$('div').on("mouseover mouseout", function() { 
    $(this).toggleClass("red blue"); });