JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.9/themes/base/jquery-ui.css">
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.9/jquery-ui.min.js"></script>
<button id="npfcClose" class="headerBtn"></button>

JavaScript

$(function() {
    $("#npfcClose").button({
        icons: {
            primary: "ui-icon-closethick"
        }
    });
});