.mian {
	position: fixed;
	z-index: 0;
	width: 100%;
	height: 100%;
	top: 0;
	left: 0;
}

.bodyDiv {
	float: left;
	width: 100%;
	height: 100%;
	background-image: url(../images/app-index-bg.png);
	background-size: 100% 100%;
	background-position: center center;
}

.downloadDiv {
	position: fixed;
	z-index: 1;
	width: 3.12rem;
	height: 0.8rem;
	background-image: url(../images/app-download.png);
	background-size: 100% 100%;
	background-position: center center;
	left: 2.19rem;
	bottom: 1.1rem;
}