body {
  font-family: "Computer Modern Serif", Georgia, serif;
  max-width: 900px;
  margin: auto;
  padding: 2rem;
  line-height: 1.6;
  background: #ffffff;
  color: #111;
}

a {
  color: #0033aa;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

header, footer {
  text-align: center;
}

code {
  background: #f5f5f5;
  padding: 0.2em 0.4em;
}