JSFiddle - React, Tailwind, and code Playground

HTML

<div>5</div>
<input type="button" value="Click to Animate" onClick="clickme()" />

CSS

div
{
    -webkit-transition: all .5s;
    -moz-transition: all .5s;
    position: absolute;
    font-size:20px;
    font-family: arial;
    margin:100px;
    left:0;
    top:0;
}

.scale {
    -webkit-transform: scale(3);
    -moz-transform: scale(3);
    }

JavaScript

function clickme() {
  $("div").addClass("scale");
}