Hi,
I have found that the skinparam command does not work for certain object types.
Have a look at this code block, which is correct according to the plantuml documentation
skinparam sequence {
ArrowColor blue
LifeLineBorderColor blue
LifeLineBackgroundColor #A9DCDF
ParticipantBorderColor blue
ParticipantBackgroundColor skyblue
ActorBorderColor blue
ActorBackgroundColor white
CollectionsBorderColor blue
CollectionsBackgroundColor skyblue
DatabaseBorderColor blue
DatabaseBackgroundColor skyblue
}
The last four commands to do with Collections and Databases do not work, meaning they show with the default red border and yellow background color scheme. The earlier commands do work and change the border and background color just fine.