.top{
    width: 100%;
}
.top>img{
    width: 100%;
}
.top .nav_box{
    width: 100%;
    height: 60px;
    background-color: #114696;
}

.nav{
    width:1200px;
    height: 60px;
    line-height: 60px;
    margin: 0 auto;
}

.nav ul{
    width: 868px;
    height: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    float: left;
}

.nav ul li a{
    width: 144px;
    height: 60px;
    line-height: 60px;
    color: #fff;
    font-weight: 600;
    font-size: 18px;
    display: table-cell;
    text-align: center;
    vertical-align: middle;
}

.nav ul li.on a{
    background-color: #002e72;
}

.nav ul li a:hover{
    background-color: #002e72;
}

.nav ul li a span{
    position: relative;
    top: 2px;
    margin-left: 2px;
}
.nav>form{
    float: right;
    margin-top: 10px;
}
.nav>form input{
    width: 218px;
    height: 40px;
    border: none;
    padding-left: 10px;
}

.nav>form button{
    width: 85px;
    height: 40px;
    border: 1px solid #002e72;
    background: url(../img/ss.png) center no-repeat;
    background-color: #002e72;
    margin-left: -4px;
    box-sizing: content-box;
    margin-top: -1px;
}