Posted by habamax on Mar 26, 2020; 9:02am
URL: https://discuss.asciidoctor.org/Display-box-around-a-block-of-text-tp7750p7795.html

There is sidebar in asciidoc which is exactly for that

Check asciidoctor manual, but in short it is just text between *** and ***:

https://imgur.com/6Fu9vjm