How to use font awesome in css "before"?

I have this code in my css snippet.
  content: "\f28a";

I want to add a font awesome before tag “choice”.
If change the content to emoji it works fine.

But it wont work when change it to fa.
And I already download the font awesome css file and put it into the
css snippet directory and loaded.

CSS file link

Just a blank here.

So how can I fix this?

The wizards in the Obsidian Discord’s #appearance channel can probably tell you.

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