body {
  background: #f0f0f0;
  font-family: Arial, sans-serif;
  color: #333;
  margin: 20px;
}
h1 { margin-bottom: 10px; }
nav a {
  margin-right: 10px;
  color: #0066cc;
  text-decoration: none;
}
nav a:hover { text-decoration: underline; }
main { margin-top: 20px; }