body {
  font-family: Arial, sans-serif;
  background-color: #f9f9f9;
  margin: 0;
  padding: 0;
}
header {
  background-color: #003366;
  color: white;
  padding: 1rem;
  text-align: center;
}
nav a {
  color: #ffcc00;
  margin: 0 1rem;
  text-decoration: none;
}
section {
  padding: 2rem;
}
img {
  display: block;
  margin: 1rem 0;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}