When styling a sequence diagram I can use gradients on participants and notes, but not on boxes around some participants. Is there any reason for this?
For example the following fails, but delete the first "/blue" and everything else works!?
@startuml
box BoxOfAlice #yellow/blue
participant Alice #yellow/blue
end box
Alice -> Bob: Hello
note over Alice #yellow/blue
fancy!
end note
@enduml