diff --git a/plantuml/plantuml.config b/plantuml/plantuml.config
index 60444858..9de1b6aa 100644
--- a/plantuml/plantuml.config
+++ b/plantuml/plantuml.config
@@ -24,12 +24,12 @@ skinparam ranksep 80
   }
 
   activityDiagram {
-    BackgroundColor lightgray
+    BackgroundColor #EEF2F6
     diamond {
-      BackgroundColor lightgray
+      BackgroundColor #EEF2F6
     }
     partition {
-      BackgroundColor transparent
+      BackgroundColor #EEF2F6
     }
   }