html {
  color-scheme: dark;
}
body {
  margin: 2rem;
  font-family: Arial, Helvetica, sans-serif, system;
}
body > * {
  font-size: 1.1rem;
}

header {
  font-size: 2.5rem;
  font-weight: bold;
  text-decoration: underline;
  text-underline-offset: 0.4rem;
  cursor: pointer;
}

ol {
  margin-block: 1.75rem;
}

ul {
  padding: 0;
  margin: 0.5rem 2ch 1rem 2ch;
}

a {
  text-decoration: none;
  font-size: 1rem;
  color: #4795e1;
}
a:hover {
  color: #9cdcfe;
  text-decoration: underline;
}
a:active {
  color: #999999;
}