Use a css code chunk to embed the CSS rules directly in your quarto document

[ManuelSpinola]

Is it possible to use a css code chunk to embed the CSS rules directly in your quarto document as in an rmarkdown document?

```{css, echo=FALSE}
p {
  font-size: 32px;
}
```

[mcanouil]

With raw html cell:

```{=html}
<style>
...
</style>
```

[cderv]

@ManuelSpinola yes any knitr feature will work with Quarto when you are knitr computation engine

---
format: html
---

```{css, echo = FALSE}
h1 {
  color: red;
}
```

# Red header 

Some content

```{r}
1 + 1
```

If you try without any R chunk inside the document, you need to explicitly configure the use of knitr engine

---
format: htlm
engine: knitr
---

See about engine binding

However, knitr will indeed write the same content from the chunk as @mcanouil answer - so directly writing raw block is a solution.

For styling with Quarto, using the theme file stays the recommended way: https://quarto.org/docs/output-formats/html-themes.html#theme-options