body {
  margin: 0;
  padding: 0;
}
body #toc a.active {
  font-weight: bold;
  border-bottom: 1px solid #ddd;
}
body #header {
  position: fixed;
  left: 0;
  top: 0;
  width: 250px;
  height: 100vh;
  background: #f4f4f4;
  padding: 20px;
  border-right: 1px solid #ddd;
}
body #content {
  margin-left: 270px;
  width: auto;
}
body #toctitle {
  display: none;
}
body .sect1 {
  display: none;
}
body .sect1:has(> h2:target) {
  display: block;
}
body .sect1 + .sect1 {
  border-top: none !important;
}
body #preamble {
  font-family: sans-serif;
  position: fixed;
  left: 0;
  padding: 20px;
  top: 20em;
  width: 250px;
}
body #preamble .note {
  display: none;
}
body #footer {
  position: fixed;
  bottom: 0;
  width: 250px;
  background: #a0a0a0;
}

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