JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/ui-lightness/jquery-ui.css">
<div id='topbar'>toggle me</div>

CSS

#topbar {
    background: orange;
    color: white;
    height: 10px;
    text-align:center;
}

JavaScript

$("#topbar").click((function() {
    var i = 0;
    return function() {
        $(this).animate({
            height: (++i % 2) ? 40 : 10
        }, 200);
    }
})());