.sacar_espacios h3,
.sacar_espacios h4 {
    margin-bottom: 5px;
}

.cuadro_navegacion {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: lightgray;
    padding: 10px;
    margin: 15px 0;
}

.iconos_navegacion {
    font-size: 25px;
    font-weight: black;
}

.iconos_navegacion a {
    margin: 0 7px;
}

.ficha-libro {
    display: grid;
    grid-template-columns: auto auto;
    margin: 10px 0;
    padding-bottom: 20px;
    border-bottom: lightgray dashed 1px;
    align-items: center;
}

.contenedor-imagen {
    padding: 0 30px 0 20px;
    margin: 15px 0;
}

.contenedor-imagen img {
    min-width: 120px;
    box-sizing: content-box;
    border: lightgray 1px solid;
    opacity: 1;
}

.ficha-isbn {
    font-size: 12px;
    margin-top: 1.5em;
    padding-top: 10px;
    border-top: lightgray solid 1px;
}

.listado_nombres {
    font-style: italic;
}

.menu_volver {
    margin: 1em 0;
    padding: 1.5em 0;
    border-top: lightgray solid 1px;
    border-bottom: lightgray solid 1px;
    display: flex;
    flex-direction: row;
    flex: 1;
    justify-content: space-around;
}

.menu_volver a {
    width: 30%;
    padding: 10px;
    background-color: gray;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    text-decoration: none;
    color: white;
}

.sin-subrayado {
    text-decoration: none;
}


/*
.info-libro {
        margin: auto 0;
}*/

.transparencia-cargando {
    filter: opacity(0.5);
}

@media only screen and (max-width: 500px) {
    .ficha-libro.sola {
        grid-template-columns: auto;
    }
}

@media only screen and (min-width: 500px) {
    .ficha-libro {
        grid-template-columns: 30% auto;
    }
    .ficha-isbn {
        display: none;
    }
}