body {
  font-family: sans-serif;
  max-width: 800px;
  margin: auto;
  padding: 2em;
  line-height: 1.6;
  background: #fafafa;
  color: #333;
}

header {
  text-align: center;
  margin-bottom: 2em;
}

h1 {
  font-size: 2.5em;
  margin-bottom: 0.2em;
}

a {
  color: #0366d6;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  padding-left: 1.2em;
}

section {
  margin-bottom: 2em;
}