*{
	padding: 0;
	margin: 0;
	list-style: none;
}

.wrapper{
	height: 500px;
	width: 500px;
	border: 1px solid black;
	margin: 0 auto;
	position: relative;
}

.start{
	height: 40px;
	width: 80px;
	background-color: #fff8dc;
	border: 1px solid black;
	font-size: 18px;
	line-height: 40px;
	text-align: center;
	position: absolute;
	top: 20px;
	left: 50%;
	margin-left: -40px;
	cursor: pointer;
}

.Content{
	height: 300px;
	width: 300px;
	border: 2px solid #ddd;
	position: absolute;
	top: 50%;
	left: 50%;
	margin-left: -150px;
	margin-top: -150px;
}
.Content .imgAera{
	height: 100%;
	width: 100%;
	position: relative;   /* 要在其中放入碎片，所以必须作为参照物 */
}

.Content .imgCell{
	float: left;
	border-radius: 4px;
	position: absolute;
	z-index: 10;
	box-shadow: 0 0 8px #fff;
	transition-property: background-position;
	transition-duration: 300ms;
	transition-timing-function: ease-in-out;

}

.Content .hover{
	opacity: 0.8;
	box-shadow: 0 0 8px #000;
	z-index: 20;
	border: 1px solid blue;
}
