body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 30px
    background-color: grey;
}

#board {
    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    grid-template-rows: repeat(8, minmax(0, 1fr));
    width: min(90vw, 480px);
    aspect-ratio: 1;
    margin: 0 auto;
}

.square {
    width: 100%;
    height: 100%;
    padding: 0;
    box-sizing: border-box;

    display: grid;
    place-items: center;

    font-size: clamp(20px, 5vw, 42px);
    line-height: 1;
}

.light {
    background-color: #f0d9b5;
}

.dark {
    background-color: #b58863;
}

.selected {
    outline: 3px solid yellow;
    outline-offset: -3px;
}

#restart {
    padding: 8px 16px;
    cursor: pointer;
}