:root {
  --book-trim-width: 152.4mm;
  --book-trim-height: 228.6mm;
  --book-body-size: 11pt;
  --book-body-leading: 1.65;
  --book-chapter-title-size: 20pt;
  --book-title-size: 28pt;
}
@page { size: 152.4mm 228.6mm; margin: 0; }