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">
<a href='#'>click me</a>
<div id='container'>
<div id='box'></div>
</div>
<div id="#container2" style="display:none">2</div>

CSS

#container, #container2 {
    width: 200px;
    height: 200px;
    position:relative;
    background: yellow;
}
#box {
    width: 100px;
    height: 100px;
    display: none;
    background: orange;
}

JavaScript

$('a').click(function() {
    $('#box').show('slide', {direction: 'down'});
   // $('#box').slideDown();
});