### Bug description

I can't directly include sass in the chunk to modify my background color.

### Steps to reproduce

````qmd
---
format: 
  html
engine: knitr
---

```{sass}
$body-bg: black !default;
```
````

### Your environment
- quarto version:  1.4.80
2023-06-27T01:31:42Z
Liripo
closed
sass doesn't seem to work
https://github.com/quarto-dev/quarto-cli/issues/6034