<html>
<head>
<style type="text/css">
p
{
position:relative;
height: 400px;
width: 800px;
background-color: white;
}
.ez-1
{
z-index: -1;
margin-top: -400px;
}
</style>
</head>
<body>
<p>Ez egy 400x800-as paragrafus fehér háttérrel, ami szépen kitakarja ami mögötte van. :)</p>
<iframe class="ez-1" src="http://www.timeanddate.com/worldclock/custom.html?sort=1" width="800" height="2140" marginwidth="5"
marginheight="5" frameborder="0" scrolling="no" >
</iframe>
</body>
</html>