body {
    margin: 0;
    background: #f2f2f2;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.book {
    width: 100%;
    max-width: 900px;
    height: 600px;
    position: relative;
    perspective: 2000px;
    margin-top: 20px;
}

.page {
    position: absolute;
    width: 100%;
    height: 100%;
    transform-origin: left;
    transition: transform 0.9s ease;
    backface-visibility: hidden;
}

.page img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: ;
}