Custom css inside a post / adding custom classes

Styles/classes are stripped out, but you can use data-theme-* attributes to target things in posts:

<div data-theme-bot>
   Content here
</div>
For example, this paragraph is wrapped in a data-theme-bot div

And then in a theme, target it like:

div[data-theme-bot] {
  background-color: red;
}
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