body {
  max-width: 700px;
  margin: 40px auto;
  font-family: monospace;
  background: #fdfdfd;
  color: #111;
  line-height: 1.5;
}

a {
  color: #0044cc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

header, footer {
  text-align: center;
}

hr {
  border: none;
  border-top: 1px solid #aaa;
  margin: 20px 0;
}

h1, h2, h3 {
  font-weight: normal;
}

ul {
  list-style-type: square;
}

@media (prefers-color-scheme: dark) {
  body {
    background: #111;
    color: #ddd;
  }
  a {
    color: #7aa2f7;
  }
  hr {
    border-top-color: #444;
  }
}