twoframes.html

<html>
        <style>
                .leftColumn {position: absolute;top:0px;left: 0px;bottom: 0px;right: 50%;background-color: #33342D;}
                .rightColumn {position: absolute;top:0px;right: 0px;bottom: 0px;left: 50%;background-color: #33342D;}
        </style>
        
    <script>
        window.setInterval(function() {
            document.getElementById('iframe1').src = document.getElementById('iframe1').src;
            document.getElementById('iframe2').src = document.getElementById('iframe2').src;
        }, 3000);    
    </script>

    <body>
        <div class="leftColumn"><iframe id="iframe1" height="100%" width="100%" src="http://simplenodeservice.staging-keptnsample.35.222.211.27.xip.io/"></iframe></div>
        <div class="rightColumn"><iframe id="iframe2" height="100%" width="100%" src="http://simplenodeservice.prod-keptnsample.35.222.211.27.xip.io/"></iframe></div>
    </body>
</html>