#book {
    position: absolute;
    left: 0px;
    top: 0px;
}

.page-image {
    height: 100%;
    background-size: cover;
    background-repeat: no-repeat;

    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    
    user-select: none;
    user-drag: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}