.sample3 {
	width: 300px;
	height: 200px;
	background-color: #CCCCCC;
	display: table-cell;
	vertical-align: middle;
}
.sample4wrap {
	width: 300px;
	height: 300px;
	background-color: #CCCCCC;
	position: relative;
}
.sample4 {
	position: absolute;
	top: 0px;
	bottom: 0px;
	margin-left: auto;
	margin-right: auto;
	width: 100px;
	height: 100px;
	background-color: #888888;
	margin-top: auto;
	margin-bottom: auto;
	left: 0px;
	right: 0px;
}