anchor.diff:  |border_color: #eeeeee
   |===
   
  -^[1]^ You should set either `line_height` or `line_height_length` and derive the value of the other using a calculation since these are correlated values.
  +. You should set either `line_height` or `line_height_length` and derive the value of the other using a calculation since these are correlated values.
   For instance, if you set `line_height_length`, then use `line_height: $base_line_height_length / $base_font_size` to define the line height.
   
   === Vertical and horizontal rhythm
  
positive.code: |+:title-logo-image: image:logo.png[top=25%, align=center, pdfwidth=0.5in]+
  |===
  
  ^[1]^ `<face>` can be `front` or `back`.
  
  ^[2]^ Controls whether the `page-number` attribute is accessible to the running header and footer content specified in the theme file.
  Use the `noheader` and `nofooter` attributes to disable the running header and footer, respectively, from the document.
  
  ////
  
negative.code: |margin_bottom: 9.600
  |===
  
  . `<n>` may be a number ranging from 1 to 6, representing each of the six heading levels.
  
  === Title page
  
  