Themes enable you to customize and brand the look and feel of navbars and page backgrounds. Themes do not control the type of links navbars can contain. When you create a theme, there are two areas you can customize styles for: the navbar layout and the page background.
At the course offering level, all themes listed on the Themes page contain information about whether a theme is shared from another org unit and the name of the org unit sharing the theme.
If your permissions do not allow you to create themes, you must select from existing themes or use the default theme.
Themes created in an org unit are automatically shared with child org units.
Themes created at the course level cannot be shared with other courses, but you can create and store them inside a course template to make them available in course offerings that use the course template.