styled code output in xaringan slides

output-classes.Rmd

---
output:
  xaringan::moon_reader:
    lib_dir: libs
    chakra: "https://cdnjs.cloudflare.com/ajax/libs/remark/0.14.0/remark.min.js"
    seal: false
    nature:
      slideNumberFormat: ""
      highlightStyle: github
      ratio: "16:9"
---

.bg-danger[
```{r, error=TRUE}
stop("Danger, Will Robinson")
```
]

```{css echo=FALSE}
.bg-danger pre + pre {
  color: red;
  background-color: #FEE;
  padding: 1em;
  border-radius: 5px;
}
```

Ah okay, thats what I thought you meant. Seems like the downside of this is how manual it is, and also you would need to know ahead of time what code will produce an output, message, warning, or error. And I guess you can only apply one CSS style to any of the above outputs produced by a single piece of code (versus different styles per type of output), right?

Unfortunately there's not really any way around this other than re-writing the kntir r chunk engine specifically for xaringan (not a recommended solution).