@media (min-width: 0) {
    .jumbo-details .display-4 {
        font-size: 36px;
    }

    .lead {
        font-size: 16px;
        opacity: 0.75;
    }

    .section {
        padding: 50px 0;
    }

    .book-card {
        width: 140px;
    }

    .book-card-cover {
        height: 212px;
    }

    .book-card-little {
        font-size: 14px;
    }

    #stylish-section .book-card {
        margin: 0 10px;
    }

    #stylish-section .book-card:hover img {
        transform: none;
    }

    .book-card-num {
        top: 35%;
        left: -35px;

        font-size: 100px;
    }

    .book-card:hover .book-card-num {
        top: 30%;
        left: -45px;
        z-index: 10;
    }

    .library-book-card {
        grid-template-columns: 130px calc(100% - 130px - 20px);
    }

    .library-book-card-img {
        height: 184px;
    }

    .library-book-card .book-card-little {
        font-size: 16px;
    }

    .library-book-card p {
        font-size: 12px;
        margin-top: 8px;
    }
}
@media (min-width: 768px) {
    .section {
        padding: 75px 0;
    }

    .book-card-little {
        font-size: 18px;
    }
}
@media (min-width: 992px) {
    .section {
        padding: 100px 0;
    }

    .lead {
        font-size: 24px;
        opacity: 0.5;
    }

    .jumbo-details .display-4 {
        font-size: 60px;
    }

    .book-card {
        width: 210px;
    }

    .book-card-cover {
        height: 297px;
    }

    .book-card-little {
        font-size: 20px;
    }

    #stylish-section .book-card {
        margin: 14px 20px;
    }

    #stylish-section .book-card:hover img {
        transform: scale(1.075);
    }

    .book-card-num {
        top: 50%;
        left: -50px;

        font-size: 150px;
    }

    .book-card:hover .book-card-num {
        top: 45%;
        left: -75px;
    }

    .library-book-card {
        grid-template-columns: 140px calc(100% - 140px - 20px);
    }

    .library-book-card-img {
        height: 198px;
    }

    .library-book-card .book-card-little {
        font-size: 20px;
    }

    .library-book-card p {
        font-size: 14px;
        margin-top: 10px;
    }
}