diff --git a/plantuml/info221-lecture-colours.ipu b/plantuml/info221-lecture-colours.ipu
index 5976ef7..a378646 100644
--- a/plantuml/info221-lecture-colours.ipu
+++ b/plantuml/info221-lecture-colours.ipu
@@ -1,7 +1,7 @@
 skinparam {
 
 	class {
-		BackgroundColor #DDE0E5
+		BackgroundColor #F2F2F2
 		BorderColor #515151
 		ArrowColor #515151
 		FontColor #515151
@@ -10,8 +10,8 @@
 	}
 	
 	sequence {
-		ParticipantBackgroundColor #DDE0E5
-		LifeLineBackgroundColor #DDE0E5
+		ParticipantBackgroundColor #F2F2F2
+		LifeLineBackgroundColor #F2F2F2
 		LifeLineBorderColor #515151
 		ArrowColor #515151
 		ParticipantBorderColor #515151