Originally Posted by Jon Westcot
Thanks. Took me a moment or three to figure out what you meant by "look a bit closer at the left side," but, when I did, I followed the rabbit hole to Feedbooks and their free version of the book. Appreciate your assistance.
The Chapter Number styling gave me the clue before I found that reference made by Kiwidude
The first time I saw the was a 'How the heck do they do that and still scale?:
Learning experience time (AKA 'Reverse engineering')
Enter Sigil an CV (and the stylesheet). Turns out to be very simple
It is all about Borders and Padding, which up until then were always Zero