:root {
  --bg: black;
  --text: white;
  --muted: gray;
  --link: violet;
}

html { color-scheme: dark; }

body {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.25rem;
  background: var(--bg);
  color: var(--text);
  font-family: 'Open Sans', serif;
  font-size: 1.125rem;
  line-height: 1.65;
}

a { color: var(--link); }

nav a { margin-right: 1rem; }

img { max-width: 100%; }

pre { overflow-x: auto; }