body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    font-family: 'Roboto', sans-serif;
    margin: 0;
}

.container {
    text-align: center;
    background: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

h1 {
    margin-bottom: 20px;
    font-size: 2.5em;
    color: #333;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-template-rows: repeat(3, 100px);
    gap: 10px;
}

.cell {
    width: 100px;
    height: 100px;
    background-color: #fff;
    border: 2px solid #000;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2em;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
}

.cell:hover {
    background-color: #f0f0f0;
    transform: scale(1.1);
}

.cell.x::before {
    content: 'X';
    color: #ff0000;
    font-size: 3em;
}

.cell.o::before {
    content: 'O';
    color: #0000ff;
    font-size: 3em;
}

button {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 1em;
    cursor: pointer;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 5px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0056b3;
}