.tab{
	position: fixed;
	top: 4rem;
	width: 100%;
	height:8rem;
	z-index: 10;
	background:#e7e7e7;
	border-bottom: 1px solid #ccc;
	
}
.tab a{
	width:11%;
	height:2.5rem;
	line-height:2.5rem;
	float:left;
	display:block;
	background:#fff;
	text-align:center;
	border-bottom:1px solid #ccc;
	border-right:1px solid #ccc;
	border-radius:5px;
	margin:1rem 0 0 5%;
	color:#999;
	text-decoration:none;
	font-size:1.2rem;
}
.tab .active{
	color:#fff;
	border-bottom:1px solid #999;
	border-right:1px solid #999;
	background:#f00;
}