JSFiddle - React, Tailwind, and code Playground

HTML

<head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
</head>
<body>
    <button>Select Client</button>
    <div><h2>Client Info</h2></div>
    
    
</body>

CSS

div {
    background-color:yellow;
    width:200px;
    height:200px;
}
h2 {
    opacity:0;
}

JavaScript

$(document).ready(function(){
    $('button').click(function(){
        $('h2').fadeTo('slow',1);
    });
});