RFE: Provide a way to control the style of the brackets injected into `btn` macros about asciidoctor-epub3 HOT 2 CLOSED

the stylesheet can control the looks btn_before and btn_after

I think these classes are too fine-grained. I think the uniform class name "enclosure" (or "envelope") would be sufficient.

Otherwise, 👍

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Hmm, now that I think about it, if the user wanted to use different opening and closing delimiters, then it might be convenient to have two classes (though it still could be achieved with CSS selectors using a single class).

I'm actually thinking that "before" and "after" are sufficient in that case. Underscores are problematic in HTML output because they could end up getting matched as formatting, so we want to avoid them.

<b class="button"><span class="before">[</span><span class="label">button text</span><span class="after">]</span></b>

Then CSS can use b.button > .before and b.button > .after to control these styles. I prefer this proposal over my previous one.

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