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

.container {
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    max-width: 600px;
    width: 100%;
}

h1 {
    text-align: center;
    color: #333;
}

#question-container {
    margin-bottom: 20px;
}

#question {
    margin-bottom: 10px;
}

.btn-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.btn {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

.btn:hover {
    background-color: #45a049;
}

.btn.correct {
    background-color: #4CAF50;
}

.btn.wrong {
    background-color: #f44336;
}

#controls {
    text-align: center;
}

#next-btn {
    display: none;
}

.hide {
    display: none;
}

#results {
    text-align: center;
}

#score {
    font-size: 18px;
    margin-bottom: 20px;
}