article ol,
article ul {
  padding-left: 1.5rem;
}

article.topic h2 {
  font-size: 1.5rem;
}

article.topic h3 {
  font-size: 1.4rem;
}

article.topic h4 {
  font-size: 1.25rem;
}

article.topic h5 {
  font-size: 1.15rem;
}

img.darker {
  filter: brightness(50%);
  transition-duration: 1s;
}

img.darker:hover {
  filter: brightness(80%);
  transition-duration: 1s;
}

footer {
  font-size: 0.875rem;
}