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

header, footer {
  text-align: center;
  padding: 16px;
  background: #222;
  color: #fff;
}

main {
  max-width: 700px;
  margin: auto;
  padding: 24px;
}

section {
  margin-bottom: 24px;
}

a {
  color: #007aff;
  text-decoration: none;
}

ul { list-style: none; padding: 0; }
li { margin-bottom: 8px; }