.header{
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    background: #ffffff;
    z-index: 100;
}
.header .logo{
    display: flex;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
    align-items: center;
    margin: 10px 0;
    color: #23ad4d;
}
.header .logo img{
    width: 40px;
    height: 40px;
    margin-right: 10px;
}
.header .nav{
    display: flex;
    align-items: center;
    padding: 15px 10px 0;
    border-top: 1px solid #e5e5e5;
    font-size: 14px;
}
.header .nav .nav-item{
    text-align: center;
    border-bottom: 2px solid #ffffff;
    padding-bottom:13px;
    display: block;
    text-decoration: none;
    color: #303133;
}
.header .nav .active{
    font-weight: bold;
    color: #23ad4d;
    border-bottom: 2px solid #23ad4d;
}