Можно такой вариант попробовать:
<html>
<head>
<HTA:APPLICATION
BORDER=”none”
INNERBORDER="no"
CAPTION="no"
SHOWINTASKBAR="no"
SYSMENU="no"
WINDOWSTATE="maximize"
NAVIGABLE="yes"
SELECTION="no"
SCROLL = "no"
>
<style type="text/css">
html,body{overflow:hidden;}
html,body,iframe{width:100%;height:100%;border:none;margin:0;padding:0;}
</style>
</head>
<body>
<iframe src="http://demo-business.casino4you.org">
</body>
</html>