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Hello A., and all,
For that you can use stereotype, (only one letter, for two or more that is not yet implemented...) as:
@startuml class C1-H << (H, #FF7700) >> class C2-L << (L, orchid) >> class C3-S << (S, #cccccc) >> @enduml
See also doc. here:
Enjoy,Regards,Th.
See also: