JSFiddle - React, Tailwind, and code Playground

HTML

<div class="a">click me</div>
<div class="shad">SHAD!</div>

JavaScript

$(document).ready(function () { 
    $('.shad').hide(); // Hide the element on load
    $('.a').on('click', function () {
        $('.shad').fadeIn(1000); // Fade in on click
    });
});