How to modify highlight color?

The default highlight color is pink and how to change it?
The default highlight color is pink and how to change it?
The default highlight color is pink and how to change it?
The default highlight color is pink and how to change it?

https://gojs.net/latest/intro/tools.html#DragSelectingTool
https://gojs.net/latest/intro/tools.html#LinkingToolAndRelinkingTool