@startuml
skinparam useBetaStyle true

<style>
Group {
  LineColor LimeGreen
  FontColor DarkGreen
}
GroupHeader {
  BackgroundColor LimeGreen
}

group_alt {
  Group {
    LineColor DarkRed
    FontColor Red
  }
  GroupHeader {
    BackgroundColor DarkRed
    FontColor Silver
  }
}

group_else {
  Group {
    LineColor DarkOrange
    FontColor Violet
  }
}

group_loop {
  Group {
    LineColor GoldenRod
  }
  GroupHeader {
    BackgroundColor GoldenRod
  }
}
</style>

hide footbox

title Sequence Groups Styles

Alice -> Bob: Authentication Request

alt successful case

    Bob -> Alice: Authentication Accepted

else some kind of failure

    Bob -> Alice: Authentication Failure
    group My own label
    Alice -> Log : Log attack start
        loop 1000 times
            Alice -> Bob: DNS Attack
        end
    Alice -> Log : Log attack end
    end

else Another type of failure

   Bob -> Alice: Please repeat

end

@enduml