html,body,div,ul,li,a{
	margin: 0px;
	padding: 0px;
}
body{
	font-size: 14px;
	font-family: "微软雅黑";
	background: #ffffff;
}
ul{
	list-style: none;
}
a{
	text-decoration: none;
}
.header{
	height: 50px;
	background: #3498db;
}
.header .nav{
	width: 1000px;
	height: 50px;
	line-height: 50px;
	margin: 0 auto;
	position: relative;
	z-index: 111;
	
}
.header .nav li{
	float: left;
	width: 14.28%;
	height: 50px;
	line-height: 50px;
	text-align: center;
}
.header .nav li a{
	color: #fff;
}

.header .nav li .second-nav{
	width: 150px;
	display: none;
	position: relative;
}
.header .nav li .second-nav li{
	position: relative;
	width: 100%;
	height: 40px;
	line-height: 40px;
	background: #3498db;
	border-top: 1px solid #efefef;
}


.header .nav li .second-nav li .third-nav{
	/*position: absolute;*/
	width:200px;
	height: 200px;
	display: none;
	margin-left: 100%;
	margin-top: -50px;
}
.arrow-down {
width:0;
height:0;
border-left:5px solid transparent;
border-right:5px solid transparent;
border-top:5px solid #efefef;
}