body {
    font-family: Arial, sans-serif;
    text-align: center;
    background: #f4f4f4;
}

h1 {
    margin-top: 20px;
}

.game-container {
    margin-top: 20px;
}

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

.cell {
    width: 100px;
    height: 100px;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    background: white;
    border: 2px solid #333;
}

.cell:hover {
    background: #ddd;
}

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