html {
  color-scheme: light;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 17px;
  line-height: 1.55;
}

body {
  background: #fff;
  color: #000;
  margin: 0;
}

header,
main,
footer {
  max-width: 74ch;
  padding: 1rem;
}

header {
  border-bottom: 1px solid #000;
}

footer {
  border-top: 1px solid #000;
  font-size: 0.9rem;
}

a {
  color: #000;
  text-decoration: underline;
}

h1,
h2,
h3 {
  font-size: 1rem;
  line-height: 1.25;
  margin: 1.5rem 0 0.5rem;
}

h1 {
  font-size: 1.25rem;
}

blockquote {
  border-left: 3px solid #000;
  margin-left: 0;
  padding-left: 1rem;
}

code {
  font-family: inherit;
}

@media (max-width: 640px) {
  html {
    font-size: 16px;
  }

  header,
  main,
  footer {
    padding: 0.85rem;
  }
}