body {
  font-family: sans-serif;
}
code {
  font-family: monospace;
  background: #ccc;
  padding: 2px;
}
pre code {
  display: block;
}
img {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 90%;
}
@media print {
  a::after {
    content: " (" attr(href) ") ";
  }
  pre {
    white-space: pre-wrap;
  }
  @page {
    margin: 0.75in;
    size: Letter;
    @top-right {
      content: counter(page);
    }
  }
  @page :first {
    @top-right {
      content: "";
    }
  }
}