body {
  font-family: Arial, sans-serif;
  max-width: 800px;
  margin: auto;
  padding: 1rem;
  line-height: 1.6;
  color: #333;
}
header, footer {
  text-align: center;
  margin: 2rem 0;
}
nav {
  text-align: center;
  margin-bottom: 2rem;
}
nav a {
  margin: 0 0.5rem;
  color: #0066cc;
  text-decoration: none;
}
nav a:hover {
  text-decoration: underline;
}