Posted by mcp292 on Aug 17, 2020; 8:56pm
URL: https://discuss.asciidoctor.org/AsciiDoctor-PDF-slide-show-presentations-tp6053p8178.html

This is the theme I'm using and it's working well:
```
extends: default
base:
  font-size: 15
heading:
  h1-font-size: 30
  h2-font-size: 25    
  h3-font-size: 20
title_page:
  authors:
    font_size: $heading_h3_font_size
```

With Dan Allen's help I found you could use `{break}` for inserting vertical space, which has been useful for positioning images.