* {
	margin:0;
	margin:0;
	padding:0;
	list-style:none;
}
.nav {
	width:100%;
	height:50px;
}
.nav ul {
	width:600px;
	height:50px;
	margin:0 auto;
}
.nav ul li {
	width:120px;
	height:50px;
	font-weight:800;
	font-size:18px;
	color:#515151;
	line-height:50px;
	text-align:center;
	float:left;
	cursor:pointer;
}
.tiao {
	width:600px;
	height:5px;
	background-color:#515151;
	margin:0 auto;
	position:relative;
	top:0;
	left:0;
}
.zhou {
	width:120px;
	height:5px;
	background-color:red;
	position:absolute;
	top:0;
	left:0;
}
.ww {
	width:0px;
	border-width:8px;
	border-style:solid;
	border-color:rgba(250,0,255,0) rgba(250,0,255,0) red rgba(250,0,255,0);
	position:absolute;
	top:-16px;
	left:56px;
}
.nei {
	width:600px;
	height:300px;
	margin:0 auto;
}
.nei li {
	width:600px;
	height:300px;
	color:#fff;
	font-family:"微软雅黑";
	font-size:40px;
	text-align:center;
	line-height:300px;
	display:none;
	margin-top:10px;
}