anchor.diff:  |left, center, right, justify
   |align: right
   
  -|title_page_background_color
  +|title_page_background_color^[1]^
   |<<colors,color>>
   |background_color: #eaeaea
   
  -|title_page_background_image
  +|title_page_background_image^[1]^
   |path (absolute or relative to pdf-stylesdir)
   |+background_image: image:title.png[]+
   
  
positive.code: |size: Letter
  |===
  
  === Base
  
  [cols="3,3,5m"]
  
negative.code: |===
  |Key |Value Type |Example
  
  |page_background_color^[1]^
  |<<colors,color>>
  |background_color: #ffffff
  
  |page_background_image^[1]^
  |path (absolute or relative to pdf-stylesdir)
  |+background_image: image:watermark.png[]+
  
  