Pagedown: where I am supposed to define these css classes?

[xf15]

where I am supposed to define these css classes?

_Originally posted by @Xinzhu-Fang in https://github.com/rstudio/pagedown/issues/50#issuecomment-460910293_

[xf15]

title: "my resume"

output: 
  pagedown::html_resume
---



<style>
.break-after-me {
  break-after: page;
}
</style>

This gives me a warning message MathJax doesn't work with self_contained when not using the rmarkdown "default" template. My resume is messed up

[jdbarillas]

Based on the documentation, it seems like you'd create a separate CSS file and include it in the output format:

output:
  pagedown::html_paged: 
    css: ["custom_css_file.css", "default-fonts", "default-page", "default"]

[xf15]

Thank you. Should read more carefully as always.
In my particular case, I did:

output:
  pagedown::html_resume:
    css: ["my_custom.css", "resume"]

then it worked.