body {
    height: 800px;
    background-color: black;
    display: flex;
    align-items: center;
}
.container {
    width: 100%;
    background-color: black;
    display: flex;
    justify-content: center;
}
.key {
    background-color: white;
    border: 3px solid grey;
    width: 50px;
    height: 200px;
    border-radius: 8px;
    margin: 5px;
    font-size: 1.5em;
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    transition: all .1s ease;
    align-content: center;
}
.playing {
    transform: scale(1.1);
    border-color: #196151;
    box-shadow: 0 0 1rem #196151;
  }