html,body {
    margin: 0;
    padding: 0;
}


.pari>td:nth-child(even){ 
    background-color: #808080;
}

.dispari>td:nth-child(odd){ 
    background-color: #808080;
}

div {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

td {
    font-size: 20px;
    padding: 10px;
}