Need css for default embed

What I’m trying to do

I’m trying to embed a file and I want the default look: the indentation, the vertical line, the link icon, the whole shebang. (I’ve got activated snippets to disable each of those things on by default).

I use the default setting so infrequently that I’m just going to use it with the cssclasses: default-embed.css frontmatter. Problem is I’m not sure what I need to add to that default-embed.css.

And now that I think of it… If I leave it disabled, not sure if I can call on it with css-classes… hmm.