body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #0780e9;
}

#game-board {
    display: grid;
    grid-template-columns: repeat(4, 80px);
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.card {
    background-color: #7da8e8;
    border: 2px solid #ccc;
    font-size: 2rem;
    padding: 20px;
    cursor: pointer;
    user-select: none;
}