#content 
{
	position:absolute;
	top:120px;
	width: 598px;
	margin-left: -300px;
	left: 50%;
	margin-left: -300px; /* negative Hälfte von width: 500px */
	height: 358px;
	visibility: hidden;
}
.demo  
{
color:#000033; 
background-color:#cccccc; 
layer-background-color:#cccccc;
position:absolute; 
top:100px; 
left:100px; 
width:480px; 
height:280px;
z-index:99;  
visibility:hidden;
}
.bodystyle
{
background-color:#000000;
background:url(../bg.jpg);
margin-left:0;
margin-top:0;
}
.iframestyle
{
filter: chroma(color=#66FF00);
}