body {
    background: #F7F7F7;
}
.logo {
	width:128px;
	height:128px;
}
.avatar {
	width:50%;
}
.wrap {
	margin:auto;
	text-align: center;
	margin-top:15%;
	margin-bottom:20%;
}
.qr-contain {
	position: absolute;
	top: 0;
	bottom:0;
	left:41%;
	right:40%;
	margin: 0 auto;
	width:35%;
	height:35%;
}
.btn {
	width:75%;
}
@media only screen 
  and (min-device-width: 320px) 
  and (max-device-width: 480px)
  and (-webkit-min-device-pixel-ratio: 2) {
	body {
		height: 90vh;
	}
	.avatar {
		width:80%;
	}
	.btn {
		width:90%;
	}
}
.wrap p span {
	font-size:1.6em;
}
.footer {
	position:fixed;
	width: 100%;
	bottom:0;
	border-top:1px solid #ddd;
	height: 30px;
	text-align:right;
	padding: 5px 10px;
	background-color:#fff;
}