.header{
    width: 1920px;
    height: 88px;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    box-shadow: 0px 4px 10px 0px rgba(0, 0, 0, 0.1);
}
.header-logo{
    display: inline-block;
    margin-left: 230px;
}
.header-log img{
    display: block;
    width: 381px;
    height: 47px;
}
.header-nav{
    height: 100%;
    margin-left: 210px;
    font-size: 20px;
    font-weight: bold;
    display: flex;
    justify-content: flex-start;
    align-items: center;
}
.header-nav>a{
    display: block;
    width: 140px;
    height: 100%;
}

.header-nav span{
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 140px;
    height: 100%;
    color: #000;
}

.header-select{
    background-color: #53A2F0;
    color: #FFF!important;
    cursor:pointer;
}

.header-nav span:hover{
    background-color: #53A2F0;
    color: #FFF;
    cursor:pointer;
}
.header-nav span:hover .header-example{
    display: block;
    background-color: #FFF;
}
.header-nav span .header-example{
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 216px;
    box-shadow: 0px 4px 18px 0px rgba(0, 0, 0, 0.2);
    z-index: 11;
}
.header-nav span .header-example a{
    display: block;
    width: 100%;
    height: 72.75px;
}
.header-nav span .header-example span{
    display: flex;
    justify-content: flex-start;
    align-items: center;
    width: 100%;
    height: 72.75px;
    box-sizing: border-box;
    padding-left: 30px;
    color: #000;
}
.header-nav span .header-example span:hover{
    color: #FFF;
}