JSFiddle - React, Tailwind, and code Playground

HTML

<div id="mydiv"></div>

CSS

#mydiv {
    background: #999;
    width: 400px;
    height: 100px;
    overflow: hidden;
}

JavaScript

$('#mydiv').fadeOut('slow', function () {
    var mydiv = $(this);
    mydiv.load('/css/style.css', function () {
        mydiv.fadeIn('slow')
    })
})