* {
    margin: 0;
    padding: 0;
    box-sizing: auto;
}

body {
    font-size: 35px;
}

table {
    border-collapse: collapse;
    border: black solid 2px;
    margin: 10px auto 0;
}

td {
    height: 50px;
    width: 50px;
    border: 1px solid #000000;
    text-align: center;
}

tr:nth-child(2n) td:nth-child(2n+1) {
    background-color: rgb(159, 159, 159);
}

tr:nth-child(2n+1) td:nth-child(2n) {
    background-color: rgb(159, 159, 159);
}