body {
  background: #cec;
  font-family: courier, monospace;
  font-weight: bold;
  line-height: 1.5;
  margin: 0 auto;
  max-width: 50em;
  overflow-wrap: break-word;
  padding: 1em;
}
h1, h2 {
  margin-bottom: 0;
}
a:empty:before {
  content: "#";
}
a:empty {
  visibility: hidden;
  padding-left: 0.25em;
}
:hover > a:empty {
  visibility: visible;
}
details summary {
  padding-left: 2em;
  text-indent: -1em;
}
details p {
  padding-left: 2em;
}
details ul {
  padding-left: 4em;
}
details[open] {
  background: #bdb;
}
svg {
  color: inherit;
  height: 0.8em;
  margin-left: 0.25em;
  vertical-align: middle;
  width: 0.8em;
}
footer {
  margin: 1em auto;
  text-align: center;
}
footer a {
  margin-right: 1.25em;
  line-height: 2.5;
}
footer a:last-child {
  margin-right: 0;
}
hr {
  margin: 1em auto;
  border: 0;
  border-bottom: 0.1em dotted #696;
}