anchor.diff:  The result looks more like a nicely rendered book than a print-to-PDF HTML page.
   
   For a file to be rendered, it has to be configured in the `doctoolchainConfig.groovy` file.
  -There you will find a section like the following:
  +There you will find a section that looks like this:
   
   ```
   inputFiles = [
  
positive.code: ====
  Why do you need to configure the files to be rendered?
  
  Asciidoctor renders all `.adoc` files by default, no matter if these are the main documents or just chapters you want to include.
  In addition, it is quite likely that you only want to convert a few files to PDF.
  Hence, you have to configure which ones.
  ====
  
  == Creating a Custom PDF Theme
  
negative.code: ]
  ```
  
  Add the files that you want to be rendered, along with the desired format.
  In this case `pdf`.
  
  .Hint
  