How to change r chunk font size of Rmarkdown project?

Question

This is my current setup:

---
title: "Project"
output: rmdformats::material
---
<style>
body{
  font-size: 10pt;
}
</style>

I would like to make r chunks even smaller in size than the font of the rest of the document. How can I achieve this?

This doesn't work:

{r, size="small"}

This didn't work either.

Answer 1

You can add your own CSS classes to R chunks using the following syntax:

```{r class.source = "small"}

print("Hello World")

```

Presume the small class name will give you the desired Material effect.