This is a problem I've always had with Mermaid too. Custom theming is a no-go; it's easier to make attractive diagrams with GraphViz. I remember the docs for M

This is a problem I've always had with Mermaid too. Custom theming is a no-go; it's easier to make attractive diagrams with GraphViz. I remember the docs for Mermaid.js talk about varying document trust levels, which is not something I want involved in a diagramming DSL.