body.light {
  background: #ffffff;
  color: #111;
}
body.dark {
  background: #111;
  color: #f0f0f0;
}
body.warm {
  background: #fdf6e3;
  color: #3b2f2f;
}
body.cool {
  background: #eaf6ff;
  color: #0b2545;
}
a {
  color: inherit;
}
nav.toc ul.chapter-list {
  display: none;
  margin-left: 1rem;
}
nav.toc ul.chapter-list.open {
  display: block;
}