div.table_menu {
    margin-bottom: 5px;
}

div.table_menu .column {
    margin-bottom: 5px;
}

/* Small devices (Phones, 600pxand down) -- this would display the text at 5.0rem on phones */
@media only screen and (max-width: 600px) {
    h3.h3_datos_contacto {
        font-size: 1.2rem; /* you can also use px here... */      
    }

    h2.h2_media_s {
        font-size: 2.6rem;
    }

    h3.h3_media_s {
        font-size: 2.3rem;
    }
}

/* Large devices (laptops/desktops, 992px and up) -- This would display the text at 10.0rem on laptops and larger screens */
@media only screen and (min-width: 992px) {
    h3.h3_datos_contacto {
        font-size: 2.5rem; /* you can also use px here... */
    }
}