* {
	margin:0;
	padding:0;
}
html,body {
	height:100%;
	overflow:hidden;
}
#wrap {
	position:absolute;
	left:0;
	top:0;
	right:0;
	bottom:0;
	margin:auto;
	width:300px;
	height:300px;
	/*border:1px solid;
	*/
				
				perspective:1000px;
}
#wrap > .box {
	position:absolute;
	left:0;
	top:0;
	right:0;
	bottom:0;
	margin:auto;
	width:300px;
	height:300px;
	transition:10s transform;
	transform-style:preserve-3d;
	/*transform-origin:center center -28.867513459481287px;
	*/
}
#wrap > .box > div {
	position:absolute;
	width:300px;
	height:300px;
	background:pink;
	text-align:center;
	font:50px/300px "微软雅黑";
	/*transform-origin:center center -28.867513459481287px;
	*/
	backface-visibility:hidden;
}
#wrap:hover > .box {
	transform:rotateY(360DEG);
}