JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://yui.yahooapis.com/3.5.0pr4/build/yui/yui-min.js"></script>
<div id="test" class="yui3-skin-sam"></div>

CSS

#test {
    height: 2000px;
}

JavaScript

YUI().use('panel', function (Y) {
    
    var panel = new Y.Panel({
        headerContent: 'A Panel',
        bodyContent  : 'cfixedcenterfixedcenterfixedcenterfixedcenterfixedcenterfixedcenterfixedcenterfixedcenterfixedcenterfixedcenterfixedcenter',
        
        render  : '#test',
        centered: true,
        
        alignOn: [
            {node: Y.one('win'), eventName: 'resize'},
            {node: Y.one('win'), eventName: 'scroll'}
        ]
    });

});