.book-modal {
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0, 0, 0);
    background-color: rgba(0, 0, 0, 0.4);
}

.book-modal-content {
    background-color: #4d3b31;
    margin: auto;
    padding: 5px;
    width: 50%;
}



/* Estilos para el botón de cerrar */

.close {
    color: #CC6F32;
    float: right;
    margin-right: 10px;
    font-size: 35px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: #a75a28;
    text-decoration: none;
    cursor: pointer;
}

.shadow-sm img {
    cursor: pointer;
}

@media (max-width: 767px) {
    .book-modal-content {
        width: 90vw;
    }

    #selectgenre {
        flex-direction: column;
        text-align: center;
    }

    #genre {
        margin-top: 10px;
        margin-left: 0;
    }

    .book {
        width: 106%;
    }
}