body {
    margin: 0;
    text-align: center;
    color: black;
    font-size: 10vw;
    overflow: hidden;
    --position: relative;
}

ul {
    margin: 0px;
}

li {
    -webkit-text-stroke: 1.2px black;
}

#song  {
    margin-left: 15vw;
}

#song li {
    float:left;
    list-style-type: none;
    padding: 0;
    margin: 0;
    margin-left: 5vw;
    font-size: 10vw;
    --width: 10%;
    transform: translateY(-10vw);
}

#song li:nth-child(even) {
    transform: translateY(-12vw)
}

#song span {

}
  
#piano li {
    display: inline-block;
    list-style-type: none;
    padding: 0;
    margin: 0;
    font-size: 18vw;
    width: 33%;
    line-height: 50vh;
    cursor: pointer;
}

.overlay{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    background-color: rgba(0,0,0,0.5);
  }