#game table {
    margin: 0 auto;
}

#game td {
    width: 80px;
    height: 80px;
    text-align: center;
    vertical-align: middle;
    font-size: xx-large;
}

#game td:first-child {
    border-right: 1px solid var(--bs-body-color);
}

#game td:last-child {
    border-left: 1px solid var(--bs-body-color);
}

#game tr:first-child td {
    border-bottom: 1px solid var(--bs-body-color);
}

#game tr:last-child td {
    border-top: 1px solid var(--bs-body-color);
}