#board {
    border-collapse: separate;
}

#board,
#score {
    margin: 0 auto;
}

#board td {
    border: 3px solid;
    text-align: center;
    --cell-size: 50px;
    width: var(--cell-size);
    height: var(--cell-size);
    font-size: 26px;
}

.PLAYER1 {
    background-color: var(--bs-primary);
}

.PLAYER2 {
    background-color: var(--bs-danger);
}

#score th,
#score td {
    text-align: center;
}

@media (max-width: 400px) {
    #board td {
        --cell-size: 36px;
        font-size: 18px;
    }
}