body {
	background-color: #000;
	margin: 0px;
	padding: 0px;
}
.centerer {
	position: absolute;
	left: 50%;
	top: 50%;
	width: 680px;
	height: 465;
	margin-top: -340;
	margin-right: 0;
	margin-bottom: 0;
	margin-left: -340;
}

.centerer2  {
    position: absolute;
    left: 50%;
    top: 50%;
    height: 465px;
    margin-top: -232px;    // 465px/2
    width: 680px;
    margin-left: -340px;    // 680px/2

}