JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <body style="background-color: tan;">
        <div id="DOMWindow" style="">
            <iframe id="DOMWindowIframe" frameborder="0" src="http://www.yahoo.com">
        </div>
    </body>
</html>

CSS

#DOMWindow {
    padding: 0px;
    height: 500px; 
    width: 400px; 
    position: absolute; 
    z-index: 10001; 
    left: 50px; 
    top: 50px;
    overflow:hidden;
}

#DOMWindowIframe{
    width:100%;
    height:100%;
    overflow:hidden;
}