body {
    font-family: Arial, sans-serif;
    text-align: center;
}

#board {
    width: 480px;
    height: 480px;
    margin: auto;
    display: grid;
    grid-template-columns: repeat(8, 1fr);
}

.square {
    width: 60px;
    height: 60px;
    font-size: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.light {
    background: #eee;
}

.dark {
    background: #555;
}