.book-page {
  max-width: 64rem;
  margin-inline: auto;
  padding-block: clamp(1.5rem, 5vw, 4rem) 5rem;
  --pmx-color-link: light-dark(#77502d, #dec09a);
}
.book-back {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--pmx-color-muted);
  font-size: 0.875rem;
  text-decoration: none;
}
.book-back:hover {
  color: var(--pmx-color-link);
}
.book-back:focus-visible {
  outline: 2px solid var(--pmx-color-focus);
  outline-offset: 3px;
}
.book-page .pmx-document {
  --pmx-document-measure: 64rem;
  padding: 0;
}
html[data-pmx-play-mode="presentation"] .book-page {
  max-width: none;
  padding: 0;
}
html[data-pmx-play-mode="presentation"] .book-back {
  display: none;
}