body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 0 10px;
    background-color: rgb(255, 253, 160);
}

.wrapper {
    background: rgb(0, 0, 0);
    border-radius: 20px;
    padding: 35px 40px;
}

.wrapper header {
    color:rgb(255, 255,255);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
header h2 {
    font-size: 2rem;
}
header .column {
    display: flex;
    align-items: center;
}
header .column span {
    font-weight: 500;
    margin-right: 15px;
    font-size: 1.2rem;
}
.volume-slider input {
    outline: none;
    accent-color: #fff;
}
.keys-checkbox input {
    width: 60px;
    height: 30px;
    cursor:pointer;
    appearance: none;
    position: relative;
    border-radius: 30px;
    background: #2e2d2c;
}
.keys-checkbox input::before {
    content: "";
    height: 20px;
    width: 20px;
    top: 50%;
    left: 5px;
    border-radius: inherit;
    position: absolute;
    background: #8c8c8c;
    transform: translateY(-50%);
    transition: all 0.3s ease;
}
.keys-checkbox input:checked::before {
    left: 35px;
    background: #fef1f1;
}
.piano-keys {
    display: flex;
    margin-top: 40px;
}
.piano-keys .key {
    cursor: pointer;
    user-select: none;
    list-style: none;
    color: rgb(163, 161, 161);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    text-transform: uppercase;
}

.piano-keys .black {
    width: 44px;
    height: 140px;
    z-index: 2;
    margin: 0 -22px 0 -22px;
    border-radius: 0 0 5px 5px;
    background: linear-gradient(#333, #000);
}
.piano-keys .black.active {
    box-shadow: inset -5px 5px 10px rgba(255,255,255,0.1);
    background: linear-gradient(to bottom, #000 , #434343);
}
.piano-keys .white {
    width: 70px;
    height: 230px;
    border-radius: 8px;
    border: 1px solid #000;
    background: linear-gradient(#fff 96%, #eee 4%);
}

.piano-keys .white.active {
    box-shadow: inset -5px 5px 20px rgba(0,0,0,0.2);
    background: linear-gradient(to bottom, #fff 0%, #eee 100%);
}
.piano-keys span {
    position: absolute;
    bottom: 20px;
    width: 100%;
    font-size: 1.13rem;
    text-align: center;
}

.piano-keys .key.hide span {
    display:none;
}

/*responsive*/
@media screen and (max-width:815px){
    .wrapper{
        padding: 25px;
    }
    header{
        flex-direction: column;
    }
    header: where(h2, .column) {
        margin-bottom: 13px;
    }
    .volume-slider input {
        max-width: 100px;
    }
    .piano-keys {
        margin-top: 20px;
    }
    .piano-keys .key:where(:nth-child(9),:nth-child(10)) {
        display: none;
    }
    .piano-keys .black {
        height: 100px;
        width: 40px;
        margin: 0 -20px 0 -20px;
    }
    .piano-keys .white {
        height: 180px;
        width:60px;
    }
}

@media screen and (max-width: 615px) {
    .piano-keys .key:nth-child(13),
    .piano-keys .key:nth-child(14),
    .piano-keys .key:nth-child(15),
    .piano-keys .key:nth-child(16),
    .piano-keys .key:nth-child(17) {
        display: none;
    }
    .piano-keys .white {
        width: 50px;
    }
}