body {
  font-family: Arial, sans-serif;
  margin: 2rem;
  background: #f9f9f9;
  color: #333;
}
header {
  text-align: center;
  margin-bottom: 3rem;
}
h1 {
  font-size: 2rem;
  color: #0066cc;
}
footer {
  margin-top: 4rem;
  text-align: center;
  font-size: 0.9rem;
  color: #777;
}