nav{
    z-index: 11;
    height: 10vh;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: center;
    transition: 0.1s;
    padding: 15px 30px;
}
.logo{
    z-index: 10;
}
.logoicon{
    z-index: 10;
    height: 4vh;
    width: 4vh;
    border-radius: 2vh;
}  
.logofont{
    color: #fff;
    font-size: 50px;
    text-decoration: none;
}
nav ul{
    display: flex;
    justify-content: center;
    align-items: center;
}
nav ul li{
    list-style: none;
    height: 100%;
}
nav ul li a{
    font-family: AlibabaPuHuiTi-Regular;
    color: #e3e3e3;
    font-size: 2.2vh;
    position: relative;
    margin: 0 15px;
    text-decoration: none;
    letter-spacing: 2px;
    font-weight: 500;
    cursor: pointer;
}


nav::before {
    content: "";
    position: fixed;
    top: -100vh;
    left: 0;
    width: 100%;
    height: 100%;
    /* background-color: rgba(0, 0, 0); */
    transition: top 0.1s ease;
    z-index: 11;
}