Config

Theme

1. default - This is the default theme for all diagrams.
2. neutral- This theme is great for black and white documents that will be printed.
3. dark - This theme goes well with dark-colored elements or dark-mode.
4. forest - This theme contains shades of green.
5. base - This is the only theme that can be modified. Use this theme as the base for customizations.

Diagram-specific Themes

%%{init: {'theme':'forest'}}%%
  graph TD
    a --> b

Example