.nav_bg{
    width: 100%;
    height: 50px;
    line-height: 50px;
    background: #005a9f;}
.nav{
    width: 1200px;
    height: 100%;
    margin: 0 auto;}
.nav ul li{
    float: left;
    width: 171px;

    text-align: center;}
.nav ul li a{
    display: block;
    color: #fff;}
.nav ul li a:hover{
  
.nav ul li:first-child{
    background: none;}
.nav ul li:first-child a:hover{
    background: #026FC2;}/*111*//*111*/