body {
    font-family: 'Arial', sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: linear-gradient(to right, #6DD5FA, #2979FF);
    color: #333;
  }
  
  #quiz-app {
    width: 90%;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  }
  
  #question-container {
    margin-bottom: 20px;
  }
  
  #question {
    font-size: 24px;
    margin-bottom: 10px;
  }
  
  .btn-grid {
    display: grid;
    grid-template-columns: repeat(2, auto);
    gap: 10px;
  }
  
  .button {
    padding: 10px 15px;
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  
  .button:hover {
    background-color: #0056b3;
  }
  
  #controls {
    justify-content: center;
    margin-top: 20px;
  }
  
  #controls.show {
    display: flex;
  }
  
  #start-btn, #next-btn {
    padding: 10px 20px;
    background-color: #28A745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  #start-btn:hover, #next-btn:hover {
    background-color: #218838;
  }
  
  .hide {
    display: none;
  }
  
  .correct {
    background-color: #28a745; /* Green color for correct answers */
    color: white;
  }
  
  .wrong {
    background-color: #dc3545; /* Red color for incorrect answers */
    color: white;
  }