body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #fafafa;
  color: #333;
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
}
header {
  text-align: center;
  margin-top: 30px;
  margin-bottom: 40px;
}
h1 {
  font-size: 2.2em;
  margin-bottom: 0;
  color: #444;
}
h2 {
  margin-top: 40px;
  color: #555;
}
footer {
  text-align: center;
  margin-top: 60px;
  color: #777;
  font-size: 0.9em;
}