html,
body {
    height: 100%;
    background-color: black;
}

#cvs {
    width: 980px;
    height: 400px;
    background-color: black;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.songlist-body {
    overflow-y: scroll;
    height: 700px;
}

.songListItem {
    color: blue;
    cursor: pointer;
}