body {
  font-family: Arial, sans-serif;
  background-color: #f0f8ff;
  margin: 0;
  padding: 0;
}

main {
  padding: 20px;
}

h1, h2 {
  color: #006400;
}

img {
  max-width: 100%;
  height: auto;
}

nav {
  background-color: #e0e0e0;
  padding: 10px;
  text-align: center;
}

nav a {
  margin: 0 15px;
  text-decoration: none;
  color: #333;
}

footer {
  text-align: center;
  padding: 10px;
  background-color: #ddd;
}