body{
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-image: url(../images/logostruktur.gif);
    background-position: center;
    background-repeat: repeat-y
    background-size: 100%;
    background-color: #5e5e4f;
}

.container{
    width: 1000px;
    border: 2px solid #f7f0f0;
    border-radius: 20px;
    padding: 35px 40px;
    background: black;

}

.container header{
    display: flex;
    font-size: 2.5rem;
    font-family: 'Helvetica';
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

header h2{
    font-size: 1.6rem;
    font-weight: 600;
    color: #f1eeee;
}

header .column{
    display: flex;
    align-items: center;
}

header .column span{
    font-size: 1.19rem;
    font-weight: 500;
    color: #f6f1f1;
    margin-right: 15px;

}

.volume-slider input{
    accent-color: #f1eeee;
}

.keys-check input{
    width: 70px;
    height: 30px;
    appearance: none;
    border-radius: 30px;
    background-color: #413e3e;
    border: #ded7d7 2px solid;
    cursor:pointer;
    position: relative;
}

.keys-check input::before{
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: inherit;
    background-color: #888581;
    top: 50%;
    left: 0.3rem;
    transition: all 0.3s ease;
    transform: translateY(-50%);
}

.keys-check input:checked::before{
    left: 2.1rem;
    background-color: #fcfaf9;
}

.piano-keys{
    display: flex;
    margin-top: 40px;
}

.piano-keys .key{
    border-radius: 10px;
    font-family: 'Courier', cursive;
    user-select: none;
    cursor: pointer;
    position: relative;
    transition: all 0.3s ease;
    text-transform: uppercase;
}


.piano-keys .white{
    width: 90px;
    height: 200px;
    background: linear-gradient(180deg, #c7c4c4, #fcfafa);
    border: #f5f0f0 6px solid;
    border-radius: 5px 5px 10px 10px;
    margin-right: 0;
    z-index: 1;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3), 0 0 10px rgba(0, 0, 0, 0.3) inset;
    background-image: linear-gradient(to bottom, #fff 0%, #eee 100%);
}

.piano-keys .white.active {
    transform: scale(0.95);
    box-shadow: inset 0px 0px 10px rgba(0,0,0, 0.7);
    background-image: linear-gradient(to bottom #fff 0%, #eee 100%);
}

.piano-keys .black{
    width: 50px;
    height: 140px;
    border: #292525 3px solid;
    background: linear-gradient(180deg, #201f1f, #0c0c0c);
    border-radius: 0 0 10px 10px;
    z-index: 2;
    margin: 0 -22px 0 -22px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3), 0 0 10px rgba(0, 0, 0, 0.3) inset;
    background-image: linear-gradient(to bottom, #535050 0%, #0f0f0f 100%);
}

.piano-keys .black.active {
    transform: scale(0.95);
    box-shadow: inset 0px -5px 10px rgba(255, 255, 255, 0.2);
    background-image: linear-gradient(to bottom #333, #434343);
}

.piano-keys span{
    position: absolute;
    width:100%;
    text-align: center;
    bottom: 0;
    font-size: 1.2rem;
    color: #ece3e3;
    font-weight: 600;
}

.piano-keys .white  span{
    bottom: 10px;
    color: #0c0c0c;
}

.piano-keys .black span{
    bottom: 10px;
    color: #fcfaf9;
}

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

.piano-keys .key.hide{
    opacity: 0;
    pointer-events: none;
}

@media screen and (max-width: 1000px){
    .container{
        width: 90%;
    }
}
    
@media screen and (max-width: 768px){
    .container{
        width: 90%;
    }
}