.firstNav{
    float: left;
    height: 90px;
    line-height: 90px;
    width: 112px;
    text-align: center;
    position: relative;
    cursor: pointer;}
.firstNav:nth-child(4){
    margin-right: 304px;}
.firstNav>a{
    display: block;
    width: 100%;
    height: 100%;
    font-size: 17px;
    color: #FFF;}
.firstNav.navAtive>a{color: #023b73;}
.firstNav>a:hover{color: #023b73;}
.secNavBox{
    position: absolute;
    top: 90px;
    left: 0;
    width: 100%;
    background-color: rgba(0,0,0,.6);
    overflow: hidden;
    z-index: 99;
    display: none;}
.secNavBox li{
    text-align: center;
    cursor: pointer;
    line-height: 36px;}
.secNavBox li a{
    display: block;
    width: 100%;
    height: 100%;
    color: #FFF;}
.secNavBox li:hover{background-image: linear-gradient(to right, rgba(79,71,212,.6), rgba(3,131,227,.6),rgba(79,71,212,.6));}
.firstNav:hover .secNavBox{display: block;}