How do I change the font in my RMarkdown2 presentation?

Rmarkdown presentation

When using the ioslides

rmarkdown presentation , I think the only way to change the font family is to provide custom CSS. Therefore, you should add the following to your preamble:

output: 
  ioslides_presentation:
    css: style.css

      

        
        
        
      

    

And then create a file style.css

in the presentation directory with something like this:

* {font-family: Helvetica !important}

      

        
        
        
      

    

RStudio R presentation

With RStudio R presentations as described here:

https://support.rstudio.com/hc/en-us/articles/200532307-Customizing-Fonts-and-Appearance

You can specify the parameter font-family

in the preamble of your file rmarkdown

. Something like that:

Presentation title
========================================
author: My name
font-family: 'Helvetica'

      

        
        
        
      

    

This will define the font family for the entire document. If you only want to customize some of the elements, such as headers, you will need to create and add a custom CSS file.