body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f8ff;
}

.game-container {
    text-align: center;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

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

#monster {
    width: 100px;
}

#equation-container {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
}

.answer-btn {
    padding: 10px 20px;
    margin: 5px;
    font-size: 18px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background-color: #4CAF50;
    color: white;
}

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

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