body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
  color: #333;
}

header {
  background-color: #4caf50;
  padding: 20px;
  text-align: center;
  color: white;
}

h1 {
  font-family: 'Playfair Display', serif;
  font-size: 36px;
  margin: 0;
}

nav {
  display: flex;
  justify-content: center;
  margin-top: 10px;
}

nav a {
  text-decoration: none;
  color: white;
  padding: 10px 20px;
  border-radius: 5px;
  background-color: #66bb6a;
  margin: 0 10px;
  transition: background-color 0.3s ease;
}

nav a:hover {
  background-color: #81c784;
}

.quiz-container {
  text-align: center;
  padding: 20px;
}

.quiz-image-container {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 20px;
}

.quiz-image-container img {
  width: 400px;
  height: 400px;
  object-fit: cover;
  border-radius: 10px;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  margin: 5px;
  cursor: pointer;
  background-color: #4caf50;
  color: white;
  border: none;
  border-radius: 5px;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #81c784;
}

.hidden {
  display: none;
}

.navigation-buttons {
  margin-top: 20px;
}