I have checked tutorial_stylesheets.
1. Some minor changes to the text.
2. I have changed the following image tutorial-syles-example.png as the original image was showing a different style that that mentioned in the text.
3. Added the image stylesheet-check.png, and added associated text to indicate the stylesheet reference in the <head> section.
https://www.mobileread.com/forums/at...1&d=1614676714