Guľaté rámy - problém

<style type='text/css'>
#site {
width:;
overflow:hidden;
padding:10px;
background-color:grey;
opacity: 0.5;
filter: alpha(opacity=50);
	-moz-opacity: 0.5;
	-khtml-opacity: 0.5;
}

.corners {
position:relative;
padding:10px 0;
color:#fff;
background-color:black;
opacity: 1.0;
filter: alpha(opacity=100);
	-moz-opacity: 1.0;
	-khtml-opacity: 1.0;
}
.cornerscenter {
width:100%;
overflow:hidden;
margin:0 -10px;
padding:0 10px;
background-color:black;
opacity: 1.0;
filter: alpha(opacity=100);
	-moz-opacity: 1.0;
	-khtml-opacity: 1.0;
}
.corners .cornerstopleft, .corners .cornerstopright, .corners .cornersbottomleft, .corners .cornersbottomright {
position:absolute;
background:url(graphic/round.png) no-repeat;
display:block;
width:10px;
height:10px;
}
.corners .cornerstopleft {left:-10px;top:0;background-position:left top;
opacity: 1.0;
filter: alpha(opacity=100);
	-moz-opacity: 1.0;
	-khtml-opacity: 1.0;
}
.corners .cornerstopright {right:-10px;top:0;background-position:right top;
opacity: 1.0;
filter: alpha(opacity=100);
	-moz-opacity: 1.0;
	-khtml-opacity: 1.0;
}
.corners .cornersbottomleft {left:-10px;bottom:0;background-position:left bottom;
opacity: 1.0;
filter: alpha(opacity=100);
	-moz-opacity: 1.0;
	-khtml-opacity: 1.0;
}
.corners .cornersbottomright {right:-10px;bottom:0;background-position:right bottom;
opacity: 1.0;
filter: alpha(opacity=100);
	-moz-opacity: 1.0;
	-khtml-opacity: 1.0;
}
</style>