.case_size {
	font-size: 0;
	margin: 0px auto;
	padding: 0;
	list-style-type: none;
	display: block;
	width: 100%;
	border: 5px solid #f7f7f7;
	border-radius: 4px;
	background-color:#fff;
	position: relative;
	clear:both;
	margin-bottom:10px;	
	overflow:hidden;
}
.case_size div.case_dummy {
	padding-top:60%;/*改变图片的高度*/
}
.case_size img{
	position: absolute;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
	
	width:100%;
	/*max-width:100%;
	max-height:100%;*/
	
	display: block;
	margin: 0px auto; /*margin: auto; 图片垂直居中对齐 */
	padding: 0;
	border: 0px solid #ddd;	
	border-radius: 0px;
}