JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <div class="wilma">Actual content</div>
    <img class="fred" src="http://harpers.org/wp-content/themes/harpers/images/ajax_loader.gif" />
</div>

CSS

.fred {
    width:50px;
}
.wilma {
    display: none;
}

JavaScript

$(document).ready(function () {
    $('.fred').fadeOut();
    $('.wilma').fadeIn();
});