I'm creating a gitbook using bookdown, and the designer wants to put a banner at the top of the book, that is, across the entire page above both the TOC and the chapter text.
If I use the before_body attribute in the YAML, bookdown inserts the code after the TOC, so the banner is only at the top of the chapter. Gitbook doesn't seem to allow for the template: attribute.
Any suggestions for how I can squeeze a line of HTML right after the < body > tag to make my designer happy? :)