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() {
    $(this).animate({
        height: ($(this).height() == 10) ? 40 : 10
    }, 200);
});