Some specifications for Rmd doc.

rmarkdown.Rmd

---
output: 
  bookdown::html_document2:
    theme: bootstrap
    	version: 5
    highlight: kate
---
  
```{r setup, include=FALSE}
library(knitr)
library(scales)
library(tidyverse)
knitr::opts_chunk$set(
	message = FALSE,
	warning = FALSE,
	comment = "#>",
	class.source = "code-chunk",
	class.output = "code-output"
)
```

```{css, echo=FALSE}
.code-chunk {
  font-weight: bold;
}

.code-output {
  border: 0px;
  font-weight: bold;
}