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;
}