.nav {
    position: fixed;
    background-color: whitesmoke;
    width: 100%;
    height: 100px;
    left: 0;
    top: 0;
    z-index: 99;
}
.navbox {
    position: relative;
    margin: 10px auto;
    width: 70%;
    height: 90px;
}
.left {
    position: absolute;
    left: 0;
    top: 10px;
    width: 60px;
    height: 60px;
    background: url(./img/ac52cc86604fe1f77724afbdedb024da.jpg) no-repeat;
    background-size: cover;
    background-position: 70% 50%;
    border-radius: 50%;
}
.right {
    position: absolute;
    right: 0;
    top: 10px;
}
        .nav .navbox .right li {
    display: inline-block;
    width: 100px;
    height: 40px;
    text-align: center;
    border-radius: 20px;
    line-height: 40px;
}
.right li a{
    text-decoration: none;
    color: black;
    font-size: 16px;
}
.xialabox .xiala {
    display: none; 
    position: absolute;
    /* margin-top: 3px; */
    margin-left: 7px;
    background-color: aliceblue;
    border-radius: 10px;
    width: 87px;
}
.xiala a {
    display: block;
    border-bottom: 2px solid gray;
    padding: 0px 16px;
}
.xiala a:hover{
    color: aquamarine;
}
.right li:hover {
    background-color: gold;
}
.xialabox:hover .xiala {
    display: block;
}