Asciidoctor provides built-in roles to align the text of a paragraph.
The name of the role follows the pattern
<alignment> is one of left, center, right, or justify (e.g.,
In Example 1 the paragraph is assigned the
text-center role in an attribute list.
[.text-center] This text is centered, so it must be important.
These built-in text alignment roles are supported by the HTML5 and PDF converters.