body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #f0f0f0;
}

h1 {
    color: #333;
}

#game-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 20px;
}

.card {
    width: 100px;
    height: 100px;
    background-color: #3498db;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 48px;
    cursor: pointer;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: scale(1.05);
}

.card.flipped {
    background-color: #2ecc71;
}