* {
	margin: 0;
	padding: 0;
	width: 100%;
	
}
body{
	overflow-y: hidden;
	background: rgba(254,207,30);
}
.back { 
	width: 100%;
	height: 85vh;
}
.back_img{
	width: 100%;
    margin-top: 60%;
}
.logo {
	z-index: 9;
	width: 150px;
	height: 250px;
	position: fixed;
	left: 50%;
	top: 13%;
	transform: translate(-50%, -50%);
}

.logoimg {
	width: 150px;
	height: 150px;
	margin-bottom: 20px;
}

.logotit {
	color: #000000;
	font-size: 36px;
}

.btn,
.btn>div {
	display: flex;
	align-items: center;
	justify-content: space-around;
	flex-wrap: wrap;
}

.btn {
	width: 70%;
	height: 60px;
	position: fixed;
	left: 50%;
	bottom: 5%;
	transform: translate(-50%, -50%);
}

.btn>div {
    color: #fff;
	width: 40%;
	height: 90px;
	padding: 0 20px;
	line-height: 90px;
	text-align: center;
	border: 1px solid #fff;
	border-radius: 60px;
}

.btn>div>img {
	width: 40px;
	height: 46px;
}

.mask {
	z-index: 99;
	background: rgba(0, 0, 0, 0.6);
	position: fixed;
	bottom: 0;
	right: 0;
	left: 0;
	top: 0;
}

.tip-content {
	width: 80%;
	height: 40vh;
	z-index: 999;
	position: fixed;
	left: 50%;
	top: 25%;
	transform: translate(-50%, -50%);
}

.back1 {
	float: right;
	width: 300px;
	height: 300px;
	background: url(../img/icon.png) no-repeat;
	background-size: 100% 100%;
}

.backs {
	height: 15%;
	width: 350px;
	padding: 20px;
	color: #FEFEFE;
	font-size: 35px;
	line-height: 60px;
	text-align: center;
	border-radius: 20px;
	border: 2px solid #fff;
	position: absolute;
	bottom: 35%;
	right: 15%;
}
 .box_app{
     color: #fff;
	text-align: center;
	position: absolute;
	top: 97%;
	font-size: 25px;
	display: block;
}