body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
  }
  
  .quiz-container {
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    width: 90%;
    max-width: 500px;
    text-align: center;
  }
  
  h1 {
    margin-bottom: 20px;
  }
  
  .hidden {
    display: none;
  }
  
  button {
    background: #007bff;
    color: white;
    border: none;
    padding: 10px 15px;
    margin-top: 20px;
    border-radius: 5px;
    cursor: pointer;
  }
  
  button:hover {
    background: #0056b3;
  }
  
  label {
    display: block;
    margin: 10px 0;
    cursor: pointer;
  }
  
  input[type="radio"] {
    margin-right: 10px;
  }