body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
  background: #f8f9fa;
  color: #333;
}

header {
  background: #0066cc;
  color: white;
  padding: 1rem;
}

nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
  font-weight: bold;
}

nav a:hover {
  text-decoration: underline;
}