@startuml scale 2 skinparam BackgroundColor transparent title Test **KO** BackgroundColor **transparent**\n and Shadowing for some empty group database database1 database database_ko { } queue queue1 queue queue_ko { } storage storage1 storage storage_ko { } database1--database_ko queue1--queue_ko storage1--storage_ko @enduml Submit amiga aws-orange black-knight bluegray blueprint cerulean-outline cerulean crt-amber crt-green cyborg-outline cyborg hacker lightgray mars materia-outline materia metal mimeograph minty plain reddress-darkblue reddress-darkgreen reddress-darkorange reddress-darkred reddress-lightblue reddress-lightgreen reddress-lightorange reddress-lightred sandstone silver sketchy-outline sketchy spacelab spacelab-white superhero-outline superhero toy united vibrant       🎉 Discover the future PlantUML Web Editor! 🚀  PNG  SVG  ASCII Art