body {
    display: flex;
    flex-direction: column;
    align-items: center;
    font-family: Arial, sans-serif;
    background-color: #f7f7f7;
}

h1 {
    margin-bottom: 20px;
}

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

.cell {
    width: 100px;
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
    background-color: #fff;
    border: 2px solid #333;
    cursor: pointer;
    transition: background-color 0.3s;
}

.cell:hover {
    background-color: #e7e7e7;
}

.cell.x {
    color: red;
}

.cell.o {
    color: blue;
}

button {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 1rem;
}