Styling and Theming

This is the last section of this chapter, but not the least important one. Mermaid lets you choose a theme from a set of pre-defined theme options such as default, base, forest, dark, and neutral. These themes have their own set of colors that are applied to a Gantt chart, so users can get the same diagram to render in different colors simply by changing the selected theme. To learn more about changing the theme and theme variables, you can refer to Chapter 5, Changing Themes and Making Mermaid Look Good.

In this section, you will learn how to add custom CSS styles to override the default colors and styles added by the selected theme in a diagram. We will also focus on the Gantt chart-specific theme variables that can be overridden to give a different look to our overall diagram. These are advanced features, and the best way of experimenting with these functionalities is to use Mermaid integrated withan HTML page. You could use a similar setup to the one you...