.nav{width: 1200px; height:auto;margin: 0 auto;overflow: hidden;margin-top: 10px}
.nav li{ float: left;width: 180px;font-size: 18px;font-weight: 600}
.nav li a{width: 180px;line-height: 30px;display: block;text-align: center;line-height: 40px; }
.nav li:hover{background: #2458AA;}
.nav a:hover{color: #FFFFFF;}