As far as I understand, the way to change colors for elements (like for instance a note box) in a sequence diagram is described like this:
* #[color|back:color];header:color;line:color;line.[bold|dashed|dotted];text:color
But this does not work for group/alt/opt/break boxes where it is only possible to control the background color. not the colors of the lines (and not dashed lines or gradients).
Is this planned to be supported in the future?
This works:
@startuml
group #pink MyGroup
Bob -> Alice : hello
end group
@enduml
But this does not work:
@startuml
group #pink;line:pink MyGroup
Bob -> Alice : hello
end group
@enduml