#gameArea {
    min-height: 300px;
    border: 3px solid #4a90e2;
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    background-color: #ffffff;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

#controlArea {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.data-item {
    display: inline-block;
    margin: 10px;
    padding: 15px;
    background-color: #e9ecef;
    border-radius: 50%;
    font-size: 2em;
    cursor: pointer;
    transition: all 0.3s ease;
}

.data-item:hover {
    transform: scale(1.1);
}

.data-item.correct {
    background-color: #90EE90; /* Light green */
    box-shadow: 0 0 10px #90EE90;
}

.data-item.incorrect {
    background-color: #FFA07A; /* Light salmon */
    box-shadow: 0 0 10px #FFA07A;
}

.highlighted {
    background-color: #ffd700;
    box-shadow: 0 0 10px #ffd700;
}

@media (max-width: 576px) {
    .data-item {
        font-size: 1.5em;
        margin: 5px;
        padding: 10px;
    }
}