How to Customize Code Chunk Background Color in RMarkdown?

Customized Code Chunk Background Color in RMarkdown

This question centers on altering the background color of a particular code chunk to highlight its significance as a bad practice. While this option is available in .Rnw using the chunk option background = 'red', it does not function in .Rmd.

The solution involves creating a custom CSS stylesheet, as R Markdown allows for customization through the class.source option. Here's how it's done:

1. Add a CSS Class: Define a CSS class, such as "badCode", to represent the chunks you want to customize.
2. Create Custom CSS: Write a CSS rule that targets the newly created class and sets the background color to your desired color, such as red.
3. Apply Class to Chunk: In the code chunk header, add the class.source option and set it to the custom class name, e.g., class.source="badCode".

For example, here's a modified Rmd file that applies a red background to the "badCode" chunk:

---
output: html_document
---

.badCode {
background-color: red;
}

summary(mtcars)

summary(cars)

This approach provides fine-grained control over the appearance of individual code chunks, allowing you to highlight specific code sections based on their significance.

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