.pk {
	position: absolute;
	width: 80px;
	height: 80px;
	top: -80px;
	background-size: contain;
	background-position: center center;
	background-repeat: no-repeat;
	transform: translate3d(0, 0, 0);
	-webkit-transform: translate3d(0, 0, 0);
	z-index: 17;

}
.pk1 {

	background-image: url(../images/pk1.png);
	z-index: 17;
}
.boom {
	width: 80px;
	height: 80px;
	transform:translate(50%);/**下移元素**/
	-ms-transform:translate(50%);
	-webkit-transform:translate(50%);
	background-image: url(../images/boom.png);
	z-index: 17;
}
.clock {
	position: absolute;
	top: 10px;
	width: 100%;
	height: 30px;
	line-height: 30px;
	border-radius: 7px;
	color: #FFC66C;
	font-size: 22px;
	letter-spacing: 3px;
	text-align: center;
	z-index: 17;
}