.header_nav li:hover a, .header_nav .cur a { color:#fff; font-size:16px;border-bottom: 3px solid #19489a;  width: 110px; }
.header{width:80%; overflow:hidden; background-color:#fff;}
.header_nav{ width:1200px; height:55px; line-height:52px; margin: 0 auto; background: #1fa300; }
.header_nav li{ float:left; width:110px; height:52px; margin: 0 11px; }
.header_nav a{ display:block; float:left; font-size:16px; width:110px; height:52px; text-align:center; color:#fff; text-decoration:none; line-height: 52px;}
.header_nav .first{ background:none;}