Thank you for your reply! I will look at the contest examples for ideas and inspiration.
I have a basic understanding of how css works, and I am doing some more study, so i should be able to manage. However, I am confused by the bookdown style.css file. The code is on two very long lines without breaks, with some other commented text in between. I have been able to format it, sort of, but I am struggling to understand why there are these two sections, and to format it so that the structure is clear.
In addition, there are five other css files (plugin-bookdown.css, plugin-fontsettings.css, plugin-highlight.csss, plugin-search.csss, plugin-table.css).
Should I be modifying these files, or style.css?
Should I perhaps not be modifying any of the css files at all but rather simply writing my own css file that contains instructions only for those parts of the bookdown css that I wish to change?
I anybody can shed any light on these matters for me so that I can move forward, I would be grateful!