body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #f4f4f4;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 600px;
  margin: 50px auto;
  padding: 20px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

h1 {
  margin-bottom: 20px;
}

.settings, .quiz, .review {
  display: none;
}

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

li {
  padding: 10px;
  background: #f9f9f9;
  margin: 10px 0;
  cursor: pointer;
  border-radius: 4px;
  border: 1px solid #ddd;
}

li.correct {
  background: #c8e6c9;
  border-color: #388e3c;
}

li.incorrect {
  background: #ffcdd2;
  border-color: #d32f2f;
}

button {
  padding: 10px 20px;
  margin-top: 20px;
  background: #007bff;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background: #0056b3;
}

#question-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 20px;
  font-size: 18px;
}

.review-question {
  text-align: left;
}

.review-question ul {
  margin: 10px 0;
}