JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content-box">
    
</div>
<div id="control-box">
    <button id="press-me">Click Here</button>
</div>

CSS

.newobj-hilite {
    background: #ff0;
}

JavaScript

$('#press-me').click(function() {
    $('<p class="effect">New content.</p>').appendTo('#content-box').addClass('newobj-hilite', 1000, callback)
});

function callback() {
   $(".effect").removeClass("newobj-hilite", 1000);
}