JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container" style="overflow: hidden">
    <div class="simpleBox">Hello world</div>
    <div class="simpleBox">Hello world</div>
</div>

CSS

.simpleBox{
    width: 150px;
    height: 150px;
    background-color: gray;
    font-size: 20px;
    float: left;
    margin: 10px;
}

JavaScript

$$('.simpleBox').morph({
        height: 50,
        opacity: 0.3
    });