JSFiddle - React, Tailwind, and code Playground

HTML

<div class="promo">
    <img src="http://pearlacademy.com/wp-content/uploads/2013/02/Circles-back-01.png" class="hover"/>
    <img src="http://pearlacademy.com/wp-content/uploads/2013/02/style.png" />
</div>

CSS

.promo img.hover,
.promo:hover img {display: none;}
.promo:hover img.hover {display: inline;}