body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f0f0f0;
    margin: 0;
    padding: 20px;
}

h1 {
    color: #333;
}

#timer {
    font-size: 24px;
    margin: 20px 0;
}

#game-board {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 10px;
    max-width: 1000px;
    margin: 0 auto;
}

.card {
    height: 50px;
    background-color: #fff;
    border-radius: 5px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 40px;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.card.flipped {
    background-color: #e0e0e0;
}

.card.matched {
    visibility: hidden;
}

#restart {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 16px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

#restart:hover {
    background-color: #45a049;
}