.case_size {
	font-size: 0;
	margin: 0px auto;
	padding: 0;
	list-style-type: none;
	display: block;
	width: 100%;

	position: relative;
	clear: both;
	margin-bottom: 10px;
	border: 1px solid #e1e1e1;
	border-radius:5px;
}
.case_size div.case_dummy {
	padding-top: 70%;/*改变图片的高度*/
}
.case_size img{
	position: absolute;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
	/*width:100%;固定图片大小*/
	/*height:100%;固定图片大小*/
	max-width: 96%;
	max-height: 96%;
	display: block;
	margin: auto;
	padding: auto;
	border: 0px solid blue;	
	border-radius: 0px;
}