.book-row, .book-line {
    margin-top: 50px;
    text-align: center;
}

.book-line {
    margin-top: 0;
    font-size: 1.5rem;
}

.book {
    margin-bottom: 30px;
    width: 340px;
    height: auto;
    border: 5px solid white;
    box-shadow: 0 0 5px #ccc;

    box-shadow:
        0 0 1px #555,
        0 0 5px #ccc;
}


@media(max-width:320px) {
    .book {
        width: 290px;
    }

    .btn-line {
        padding:12px 40px;
    }

    .book-line {
        margin-top: 0;
        font-size: 1.25rem;
    }
}