body {
    margin: 0;
}

.melody-wrapper {
    width: 100vw;
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
    position: relative;
}

.melody-wrapper .keyboard {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
}

.melody-wrapper .notes {
    width: 100%;
}