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

.grid {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.cell {
    width: 100px;
    height: 100px;
    background-color: gray;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.on {
    background-color: gold;
}

.winner {
    display: none;
    font-size: 24px;
    margin-top: 20px;
}