.box-member {
    position: relative;
    display: block;
}
.list-member {
    position: absolute;
    color: black;
    width: 80%;
    top: 150%;
    left: 10%;
    background: #fff;
    padding: 15px 30px;
    border-radius: 10px;
    box-shadow: #b9b9b9 2px 5px 10px 10px;
    z-index: 100;
    visibility: hidden;
    opacity: 0;
    transition: all ease-in-out 0.2s;
}
.list-member.show-member {
    visibility: visible;
    opacity: 1;
}