body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
}

#game-container {
    text-align: center;
}

#header {
    margin-bottom: 20px;
}

#game-board {
    display: grid;
    grid-template-columns: repeat(4, 100px);
    grid-gap: 10px;
    justify-content: center;
}

.card {
    width: 100px;
    height: 100px;
    background-color: #ccc;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    cursor: pointer;
    border: 1px solid #ddd;
    transition: transform 0.3s;
}

.card.flipped, .card.matched {
    background-color: #fff;
    /* transform: rotateY(180deg); */
}

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