body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #333;
}

header {
  background: #004080;
  color: #fff;
  padding: 2rem;
  text-align: center;
}

header h1 {
  margin: 0;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

section {
  margin-bottom: 2rem;
}

h2 {
  color: #004080;
}

pre {
  background: #eee;
  padding: 1rem;
  border-radius: 4px;
  overflow-x: auto;
}

footer {
  background: #eee;
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
}