body {
    font-family: Arial, sans-serif;
    background: #222;
    color: white;
    text-align: center;
    margin-top: 40px;
}

.board {
    width: 306px;
    margin: 20px auto;
    display: grid;
    grid-template-columns: repeat(3, 100px);
    gap: 3px;
}

.cell {
    width: 100px;
    height: 100px;
    background: white;
    color: black;
    font-size: 50px;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}

.cell:hover {
    background: #ddd;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
}