The css provided by Reveal.js seems responsible for the vertical limit. Hence it seems you have no choice, but to tweak the css yourself.
For example, modify the file css/reveal.css
(and regenerate css/reveal.min.css
).
Or you could try to override this value with an additional theme you would provide. For example, copy css/theme/default.css
to css/theme/mine.css
, define the style you want for the code blocks, and link to this file in the <head>
of your .html
presentation file.