body {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  background: #f7f7f7;
  color: #333;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

header {
  background: #111;
  color: white;
  padding: 1rem;
  text-align: center;
}

header h1 {
  margin: 0;
}

nav {
  margin-top: 0.5rem;
}

nav a {
  color: #eee;
  margin: 0 1rem;
  text-decoration: none;
}

main {
  padding: 2rem;
  max-width: 800px;
  margin: auto;
  background: white;
}

footer {
  text-align: center;
  padding: 1rem;
  background: #111;
  color: #fff;
  margin-top: 2rem;
}