.book-image {
    background-image: url(https://images.marianweb.net/images/forms/7-Habits-3D-small-250w.png);
    width: 250px;
    height: 373px;
    background-repeat: no-repeat;
    padding: 5px;
    float: center;
    background-position: center;
}

@media (max-width: 480px) {
    .book-image {
        background-image: url(https://images.marianweb.net/images/forms/7-Habits-3D-small-250w.png);
        width: 250px;
        max-width: 100%;
        height: 373px;
        background-repeat: no-repeat;
        padding: 5px;
        background-position: center
    }
}