JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/themes/start/jquery-ui.css">
<a href="javascript:void();">Open popup</a>
<div tabindex="1" class="popup">A popup</div>

CSS

.popup {
    outline: none;
    background: #bbb;
    padding: 20px;
    display: none;
}

JavaScript

$('a').click(function() {
    $('.popup').show().focus();
});
$('.popup').blur(function() {
    $(this).hide();
});