#game-board {
    display: grid;
    grid-template-columns: repeat(10, 20px);
    grid-template-rows: repeat(20, 20px);
    gap: 1px;
    background-color: #ccc;
    width: fit-content;
    margin: 20px auto;
}

.cell {
    width: 20px;
    height: 20px;
    background-color: #fff;
}

.filled {
    background-color: #000;
}