title: How to add CSS external files to be used by my R package function?
body: <p>I'm making a personal package and would like to load a css file in one of the functions in this package in order to have a "default style". What is the optimal way of doing this? </p>
  
  <p>I cannot find any documnetation that helps me understand how to work with external data like a css file, mostly what I find is about exporting external datasets to be loaded separately, etc.</p>