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

#board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-template-rows: repeat(3, 100px);
    gap: 5px;
    margin: auto;
    width: 315px;
}

.cell {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 36px;
    background-color: #ddd;
    border: 2px solid black;
    cursor: pointer;
}

.cell:hover {
    background-color: #ccc;
}

button {
    margin-top: 20px;
    padding: 10px;
    font-size: 16px;
}