Using R Quarto to create PDF documents, how can I center code chunk output and add a background color?

Question

This question builds off a previous question of mine: How can I center the output of general R results in Quarto?

But this time, in a R Quarto script that creates PDF output using xelatex, I can print general R object and the results will be left aligned on a white background. How can I center align general R results while changing the background color and text color of the output?

The code provided is from a default template Quarto file, and the image shows the results being left aligned by default.

```{r}
mtcars
```

If I am creating HTML output, I can use the following code to accomplish this. But this does not work for PDF documents.

<style>
.styled-output .cell-output {background-color:#212121}
.styled-output .cell-output pre {max-width:fit-content; margin-left:auto; margin-right:auto; color:#ececec}
</style>

```{r}
#| classes: styled-output
mtcars
```

Answer 1

Changing the background- and text-color is easy. Aligning the output with inner margins seems to be difficult. This is the closest to your requirement I could get:

---
title: |
  \huge \textbf{Title}
format: 
  pdf:
    fig-format: pdf
    code-block-border-left: false
    code-block-bg: false
    fig-align: center
    include-in-header: 
      text: |
        \usepackage{fvextra} % Extended fancyvrb
        \usepackage{xcolor}  % For coloring
        \usepackage{etoolbox} % For redefining environments
        
        % Define custom colors
        \definecolor{outputbg}{HTML}{212121} % Black background
        \definecolor{outputfg}{HTML}{ececec} % White text
        
        % Customize Verbatim environment
        \DefineVerbatimEnvironment{verbatim}{Verbatim}{
          formatcom=\color{outputfg},
          bgcolor=outputbg,
          frame=none,
          fontsize=\small,
          bgcolorpadding = 2em
        }

       
execute:
  warning: false
  message: false 
  error: false
  echo: true
---

# Xelatex custom Verbatim style


```{r}
mtcars
```