body{
    background:red !important;
}
body {
    margin: 0;
    padding: 30px;
    background: #e5e5e5;
    display: flex;
    justify-content: center;
    font-family: Arial, sans-serif;
}

.book {
    width: 600px;
    height: 800px;
    position: relative;
    perspective: 2000px;
}

/* Cada hoja */

.page {
    position: absolute;
    width: 100%;
    height: 100%;
    transform-origin: left center;
    transform-style: preserve-3d;
    transition: transform 1s;
    cursor: pointer;
}

/* Cara delantera y trasera */

.front,
.back {
    position: absolute;
    width: 100%;
    height: 100%;
    background: white;
    backface-visibility: hidden;
    box-shadow: 0 0 10px rgba(0,0,0,0.3);
}

.front {
    z-index: 2;
}

.back {
    transform: rotateY(180deg);
}

/* Giro de la hoja */

.page.flipped {
    transform: rotateY(-180deg);
}

.content {
    padding: 20px;
    text-align: center;
}

.content img {
    max-width: 100%;
    max-height: 750px;
}