Custom CSS Classes

Note that because this demonstration uses rmarkdown::html_document(), we can use Bootstrap classes to customize the chunk outputs.

# setup
knitr::opts_chunk$set(
  class.output  = "bg-success",
  class.message = "bg-info text-info",
  class.warning = "bg-warning text-warning",
  class.error   = "bg-danger text-danger"
)

paste("Normal", "R chunk", "output!!")

## [1] "Normal R chunk output!!"

message("This is a message")

## This is a message

warning("This is a warning")

## Warning: This is a warning

stop("An error occurred in this chunk.", call. = FALSE)

## Error: An error occurred in this chunk.