#sm{
	margin-top:20px;
	 box-shadow: 1px 1px 12px #000;
	}
.sm {
	list-style:none; 
	width:590px; 
	height:283px; 
	display:block; 
	overflow:hidden;
	margin-left:auto;
	margin-right:auto;
	}
	
.sm li {
	float:left; 
	display:inline; 
	overflow:hidden;
	}