There are these yellow boxes in the interactive tutorial that show notes and tips. How can you make them on your own? None of the style presets seemed to look like they would work, and I couldn’t find any styling info by highlighting the text.
They are single-cell tables. If you insert a table and them pare it down to one cell, using the table palette you can set a background and border colour. Probably not the best use of tables for things you intend to export out of Scrivener—but that’s how they are done.