@media (prefers-color-scheme: dark) {
  body {
    color: #fff;
    background: #000;
  }
  a:link {
    color: #9cf;
  }
  a:hover,
  a:visited:hover {
    color: #cef;
  }
  a:visited {
    color: #c9f;
  }
}
body {
  margin: 1em auto;
  max-width: 40em;
  padding: 0 0.62em;
  font: 1.2em/1.62 sans-serif;
}
h1,
h2,
h3 {
  line-height: 1.2;
}
.container {
  display: flex;
  flex-direction: column;
  justify-content: center;
}
#output {
  max-width: 100%;
  align-self: center;
}
@media print {
  body {
    max-width: none;
  }
}