JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
    <title>HTML5 iframe Test</title>
</head>
<body>
    <div id="headerdiv">
        <iframe id="headerframe" src="http://www.freewebfiles.com/"></iframe>
    </div>
    <div id="contentdiv">
        <iframe id="contentframe" src="http://www.blackbeltcoder.com"></iframe>
    </div>
</body>
</html>

CSS

body{overflow:hidden;}
#headerdiv {
/*    width: 100%;*/
    height: 130px;
}
#contentdiv {
width: 100%;
    position:absolute;
    top:130px;bottom:0;
}
#headerframe {
    width: 100%;
    
}
#contentframe {
    width: 100%;height:100%;
}