body {
  font-family: sans-serif;
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
  background: #f9f9f9;
  color: #333;
}
header, footer {
  text-align: center;
  margin-bottom: 2rem;
}
h1 {
  color: #0055aa;
}
a {
  color: #0077cc;
}