body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background: #fafafa;
  color: #222;
}
header, footer {
  background: #f0f0f0;
  padding: 1rem;
}
nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #0066cc;
}
main {
  padding: 2rem;
  max-width: 800px;
  margin: auto;
}