.dropbtn {
    border: none;
    cursor: pointer;

    text-decoration: none; /* 设置下划线 */
    color: #0a1533;
    /* color: #242424; */
    display: block; /* 选择用块来展示，不需要点到文字上才可以超链接*/
    transition: 0.3s background-color; /* 悬停的过渡效果*/
    /* border-bottom: 1px solid #888; */
}

.dropdown {
    position: relative;
    /* display: inline-block; */
}

.dropdown-content {
    display: none;
    position: absolute;
    /* background-color: #444; */
    /* background-color: #242424; */
    background-color: #0a1533;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}

.dropdown-content {
    /* 居中显示 */
    left: 50% !important;
    right: auto !important;
    transform: translate(-50%, 0) !important;
}

#achi {
    min-width: 330px !important;
}

.dropdown-content a {
    color: #242424;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

/* .dropdown-content a:hover {background-color: #f1f1f1} */

.dropdown:hover .dropdown-content {
    display: block;
}

#member {
    z-index: 10;
}
#research {
    z-index: 9;
}