*{
	padding: 0;
	margin: 0;
}
a {
	text-decoration: none;
	-webkit-tap-highlight-color: rgba(255, 255, 255, 0);
	-webkit-user-select: none;
	-moz-user-focus: none;
	-moz-user-select: none;
}
.all{
	height: 100vh;
	display: flex;
	flex-direction: column;
}
.nav{
	height: 2.8125rem;
	line-height: 2.8125rem;
	text-align: center;
	position: relative;
	background-color: #fff;
}
.nav a{
	position: absolute;
	top: 0;
	left: 10px;
}
.nav a i{
	color: #666;
}
@media screen and (max-width:600px) {
	.all{
		width: 100%;
	}
}
@media screen and (min-width:600px) {
	.all{
		width: 600px;
		margin: 0 auto;
	}
}