How to Customize Chunk Background Color in RMarkdown?

Custom Chunk Background Color in RMarkdown

In RMarkdown, customizing the background color of individual code chunks enhances readability and highlights critical information. While adding the background option in .Rnw offers this functionality, it's not directly transferable to .Rmd.

To achieve the desired result, we can utilize the class.source option within the code chunk header. This option allows us to apply custom CSS styles to specific chunks.

Example:

Consider the following example, where we create a custom CSS class called "badCode" to highlight problematic code:

---
output: html_document
---

.badCode {
background-color: red;
}

Next, we create a code chunk and assign the "badCode" class to change its background color:

summary(mtcars)

summary(cars)

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