nav{
    position: fixed;
    width: 100%;
    margin: 0;
    z-index: 2;
    padding: 0 10%;
    background-color: rgba(0, 0, 0 ,0.4);
    display: flex;
    height: 80px;
    justify-content: space-between;
    color: white;
    font-family: 'Microsoft YaHei'
}
nav div ul li a{
    text-decoration: none;
    color: white;
}
nav div ul li a:hover{
    text-decoration: none;
    color: #2BC3AC;
}
nav div:nth-child(1){
    width: 20%;
}
nav div:nth-child(1) img{
    margin: 9% 0;
}
nav div:nth-child(2){
    width: 70%;
}
nav div ul{
    display: flex;
}
nav div ul li{
    padding: 0 3%;
    display: block;
    list-style:none;
    line-height: 78px;
}
nav div ul li:hover{
    color: #2BC3AC;
    cursor: pointer;
    border-bottom: 2px solid #2BC3AC;
}