anchor.diff:    indent: $base_font_size * 1.5
   ----
   
  -When creating a new theme, you only have to define the keys you want to override from the base theme.
  -The converter uses the information from this map to help construct the PDF.
  +When creating a new theme, you only have to define the keys you want to override from the base theme (PENDING, see https://github.com/asciidoctor/asciidoctor-pdf/issues/132[#132]).
  +The converter uses the information from the theme map to help construct the PDF.
   All the available keys are documented in <<keys>>.
   
   Keys may be nested to an arbitrary depth to eliminate redundant prefixes (an approach inspired by SASS).
  
positive.code: The theme language supports color values in three formats:
  
  Hex:: A string of 3 or 6 characters with an optional leading `#`.
  RGB:: An array of numeric values ranging from 0 to 255.
  CMYK:: An array of numeric values ranging from 0 to 1 or from 0% to 100%.
  
  
negative.code: ----
  base:
    font_color: #ff0000
  ----
  
  It's also possible to specify no color by assigning the special value `transparent` as shown here:
  
  [source,yaml]
  ----
  base:
    background_color: transparent
  ----
  
  ==== RGB
  