#background3d {
    position: absolute;
    left: 0px;
    right: 0px;
    top: 0px;
    bottom: 0px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}

#wrapper3d {
    position: relative;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

#scene3d {
    perspective: 1000px;
    position: relative;
}

#book3d {
    position: relative;
    transform-style: preserve-3d;
    transform: rotateY(40deg);
}

#book-front {
    position: absolute;
    background-size: cover;
    background-repeat: no-repeat;
}

#book-back {
    position: absolute;
    background-size: cover;
    background-repeat: no-repeat;
}

#book-right {
    position: absolute;
    background-size: cover;
    background-repeat: no-repeat;
}

#book-left {
    position: absolute;
    background-size: cover;
    background-repeat: no-repeat;
}

#book-top {
    position: absolute;
    background-size: cover;
    background-repeat: no-repeat;
}

#book-bottom {
    position: absolute;
    background-size: cover;
    background-repeat: no-repeat;
}

#book-bottom-shadow {
    background-color: #000000;
    position: absolute;
    background-size: cover;
    background-repeat: no-repeat;
    filter: blur(30px);
    opacity: 0.5;
}