body {
	margin: 0px;
	background-color: #000000;
}

.main{
	position: absolute;
	width: 1000px;
	height: 600px;
    top: 50%;
	left: 50%;
	margin-top: -300px;
	margin-left: -500px;
	/*border: solid red 1px;*/
}
.content{
   position: absolute;
   top: 50%;
   left: 50%;
   width: 640px;
   height: 480px;
   margin-top: -240px;
   margin-left: -320px;
}