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Hi,
There is an extra space in your skinparam definition. You should use: backgroundColor<<static lib >> DarkKhaki Insteaf of: backgroundColor <<static lib >> DarkKhaki Result here: http://plantuml.com/plantuml/uml/TO_12i8m44Jl-Ohz1JsNGbl1WmXUfNZO9g4DIREwJV4W_hirL5khNfPbcDqtKsRP2PAa2nYC16SgI5DHvdaK6sIjtc9HV3izAGtFiPhMzNGQjS6cC625dOO3a-fbCEH5Puq_8sCBajepUUq3t4I5qjPClLS5EU853pR8TjUWDJ-CyxImPQszkCyeCSi085QQuyreMdo2etQEhdy1OoVOOpr4nW_6gsU-U9bTUdm0