body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f8f8f8;
  color: #333;
}

header, footer {
  background-color: #003366;
  color: white;
  padding: 15px;
  text-align: center;
}

nav {
  background-color: #0055a5;
  padding: 10px;
  text-align: center;
}

nav a {
  color: white;
  text-decoration: none;
  margin: 0 15px;
}

main {
  padding: 20px;
}