Hello,
What is the setting that controls the font size of the callout that appears in a listing? For example, given a code block like this:
[source,ruby]
----
require 'sinatra' // <1>
get '/hi' do // <2>
"Hello World!" // <3>
end
----
<1> Library import
<2> URL mapping
<3> HTTP response body
I want to know the setting that will control the size of the callout that appears
next to the code as in below:

The conum.font_size property controls the size of callout that appears
below the listing (that is
not what I want to control):

I am using asciidoctor-pdf and while the size of the second callout is okay, the callout that appear in the listing are extremely tiny as shown below: