body {
  max-width:650px;
  margin:40px auto;
  padding:0 10px;
  font:18px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  color:#444
}
h1,
h2,
h3 {
  line-height:1.2
}
@media (prefers-color-scheme: dark) {
  body {
    color:#c9d1d9;
    background:#0d1117
  }
  a:link {
    color:#58a6ff
  }
  a:visited {
    color:#8e96f0
  }
}