JSFiddle - React, Tailwind, and code Playground

HTML

<div id="frame_app">
    <iframe src="http://demo.consulenzait.it/cms_trasparenza/default.aspx?0*0*0*1" id="app" name="app" ></iframe>
</div>

CSS

#frame_app {    
position: relative;
padding-bottom: 65.25%;
padding-top: 30px;
height: 0;
overflow: auto; 
-webkit-overflow-scrolling:touch;
border: 0 none;
}
#frame_app iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100% !important;
    height: 100% !important;
    border: 0;
}
 #frame_app iframe html body {border: 10px solid red !important;}

JavaScript

//non funge
var $iframe = $('#app');
$iframe.ready(function() {
    $iframe.contents().find("head").append("<link rel='stylesheet' href='http://demo.consulenzait.it/Repository/Demo/Upload/2015/id_56/style_app.css'>");
});