.nav{
	font-family:"微软雅黑";
	font-size:16px;
	color:#333;
	text-align: center;
	height: 50px;
	/*width: 1170px;*/
	/*background-color:lightcyan;*/
	border-bottom: 1px solid #ededed;
	
}

.nav_menu ul li a{
	font-size:30px;
	font-family:"微软雅黑";
	color:#333;
	height: 50px;	
	text-align: center;

}

.nav_banner{
	float:left;
	height: 50px;
	padding: 7px 40px; 
}

.nav_menu{
    float: left;
    width:920px;
    height:50px;
    padding: 0 ;
}


.nav_menu ul {
    float:left;
    margin: 0px;
    padding: 0 0 0 0;
    width: 920px;
    /*height: 100%;*/
    list-style: none;
}


.nav_menu ul li {
    display: block;
}


.nav_menu ul li a {
    float: left;
    padding: 10px 20px; 
    font-size:16px;
    color:#333;
    outline: none;
    text-decoration: none; 
}

.nav_menu li a:hover {
    color: green;
    border-bottom: 2px solid green;
}



/*
.nav_menu li:hover {
	color: green;
    border-bottom: 1px solid green;
}
*/