Sometimes, Scribble’s primitives and built-in styles are insufficient to produce the output that you need. The cases in which you need to extend or configure Scribble fall into two groups:
You may need to drop into the back-end “language” of CSS or Latex to create a specific output effect. For this kind of extension, you will mostly likely attach a css-addition or tex-addition style property to style, where the addition implements the style name. This kind of extension is described in Implementing Styles.
You may need to produce a document whose page layout is different from the Racket documentation style. For that kind of configuration, you can run the scribble command-line tool and supply flags like --prefix or ++style, or you can associate a html-defaults or latex-defaults style property to the main document’s style. This kind of configuration is described in Configuring Output.