Usage:
!include https://raw.githubusercontent.com/dmitrvk/plantuml-black-and-white/main/base.puml
Full example:
'PlantUML Online Editor: https://www.planttext.com/
@startuml
!include https://raw.githubusercontent.com/dmitrvk/plantuml-black-and-white/main/base.puml
() A
() B
A .> B
@enduml