Dynamic css clasees to color button did not work

Adding these classes to the safelist in assets/tailwind.config.js makes them work. I could not find another way to get it work.
This is also covered in https://elixirforum.com/t/using-generated-class-names-in-tailwind-under-phoenix-1-7/57995

```
safelist: [
"bg-red-500",
"hover:bg-red-600",
"bg-green-500",
"hover:bg-green-600"
],

```
Version info:
```
phoenix 1.7.20
phoenix_html 4.2.1
phoenix_live_reload 1.5.3
phoenix_live_view 1.0.7
tailwind 0.3.1
```