body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  text-align: center;
  padding: 20px;
}

#quiz-container {
  background: white;
  max-width: 600px;
  margin: 0 auto;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

ul {
  list-style: none;
  padding: 0;
}

li {
  margin: 10px;
  background: #eee;
  padding: 12px;
  cursor: pointer;
  border-radius: 5px;
  transition: background 0.3s;
}

li:hover {
  background: #ccc;
}

#next-btn {
  margin-top: 15px;
  padding: 10px 20px;
  font-size: 16px;
  background: #333;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}