table {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

td {
    border: solid 2px black;
    padding: 5px;
}

thead {
    text-align: center;
}

#contenedor {
    padding: 30px;
}

@media screen and (max-width: 520px) {
    table {
        font-size: x-small;
    }
}