table{
    border: double 6px black;
    margin: auto;
}

tr{
    height: 80px;
}

td{
    width: 80px;
    text-align: center;
    font-size: 3em;
}

/* Filas impares columnas pares */
tr:nth-child(odd) td:nth-child(even){
    background-color: black;
    color: white;
}


/* Filas pares columnas impares */
tr:nth-child(even) td:nth-child(odd){
    background-color: black;
    color: white;
}