You can go a few ways. First you can use width:#####
and height:#####
in the frontmatter to specify a custom max height/width for your whole presentation.
You could also use a custom css file (e.g. css: mypres.css
) where you modify the .reveal pre
and .reveal code .r
and (perhaps) the .reveal .slides
CSS styles to fit your needs.
Smaller text == harder to read on a big screen. Wider box == might not fit well on a big screen.