How to create a global CSS for all mermaid diagrams?

Hello! I am pretty new to CSS styling, especially in the context of obsidian. I would like to write a .css file for a theme to apply to all my mermaid diagrams and I need some help with that. How should I write it?

It’s going to depend on exactly what you want to do how the CSS is written. Hopefully these links can get you started:

Thanks for sending these links. I just want to write a css code to standardize my mermaid charts, but I am not sure how to start writing.