Two things to add:
- I put animate.css in the Additional HTML to create a nice fade-in (see the classes on the checkmark)
- If you want to add checkmarks to the course home page (where all sections are displayed at once like the picture below, that involves a custom course format that uses mustache templates, so it's another project on its own. I don't know my workplace policy for sharing code but if they let me publish it I'll let you know.
