#download_book_section img {
    box-shadow: 8px 8px 16px 0 rgba(0,53,101,0.2);
    border-radius: 4px;
}

@media (max-width: 992px) {
    #download_book_section .box-left,
    #download_book_section .box-right {
        min-width: 100%;
    }
}