body {
    background-image: url(assets/background-body.jpg);
    background-color: black;
    background-size: cover;
    max-height: 100vh;
    margin: 0;
    padding: 1em;
    font-family:'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

/* Header */
header {
    width: 100%;
    color: yellow;
    text-align: start;
    padding: 1rem;
    letter-spacing: 0.1rem;
    margin: 0 auto;
}

header p {
    color: white;
    font-size: smaller;
}

#piano {
    margin: auto;
    width: 70%;
    max-width: 800px;
    height: 300px;
    background: #ffffff40;
    box-shadow: 0 8px 32px 0 #1f26875e;
    backdrop-filter: blur( 4px);
    -webkit-backdrop-filter: blur( 4px);
    border-radius: 10px;
    border: 1px solid #ffffff2e;
    position: relative;
}

#keys {
    width: 90%;
    position: absolute;
    bottom: 10px;
    height: 65%;
    margin: 5%;
}

.whiteKeys {
    width: 7%;
    height: 100%;
    background-color: white;
    position: absolute;
    border: 2px solid black;
    cursor: pointer;
}

.whiteKeys:active {
    background: linear-gradient(to bottom, #f8f8f8, #eeeeee, grey);
    box-shadow: 2px -2px black inset, -4px -2px black inset;
}

.whiteKeys:hover {
    background-color: #e4e4e4;
}

.blackKeys {
    width: 3.5%;
    height: 50%;
    background-color: #474747;
    position: absolute;
    cursor: pointer;
}

.blackKeys:hover {
    background-color: #242424;
}

.blackKeys:active {
    background-color: black;
}

.keyNumber {
    position: absolute;
    bottom: 5px;  
    left: 50%;
    transform: translateX(-50%);
    color: black; 
    font-size: 12px; 
    font-weight: bold; 
}

#volumeBar {
    position: absolute;
    right: 50px;
    top: 50px;
}

.fa-volume-up {
    color: yellow;
    font-size: 36px;
}

.fa-plus {
    color: green;
    cursor: pointer;
}

.fa-minus {
    color: red;
    cursor: pointer;
}

#volume {
    font-weight: 800;
    font-size: 1.5rem;
    user-select: none;
    color: white;
}