Styling and Theming

This is the last section in this chapter, but but definitely not the least. In this section, you will learn how to add custom CSS styles to a specific class in the diagram. We will also focus on the class diagram-specific theme variables that can be overridden to give a different look to our overall diagram. Again, these are advanced features, and the best way of experimenting with these functionalities is to use Mermaid integrated on an HTML page. You could use a similar setup to the one you followed for the interaction. That way, you will have control over the <style> tag and the Mermaid theme variable configurations.

Let's start by looking at the custom styles that only impact the classes for which those custom styles are attached.

Styling a specific class of a class diagram

In Mermaid, it is possible to supply your own custom CSS styles and apply them to only specific elements of the class diagram. By this, we mean that it is possible to...