diff --git a/plantuml/plantuml.config b/plantuml/plantuml.config
index ff1c66ad..60444858 100644
--- a/plantuml/plantuml.config
+++ b/plantuml/plantuml.config
@@ -7,24 +7,19 @@ skinparam ranksep 80
     FontName "Noto Sans Regular"
     FontSize 12
     RoundCorner 10
-    LineThickness 1.5
     BackGroundColor transparent
+    LineColor #8ec1e1
+    LineThickness 1
   }
   node {
-    BackgroundColor lightgray
-  }
-  arrow {
-    Color #666666
-    LineThickness 2
+    BackgroundColor #EEF2F6
   }
   group {
-    BackgroundColor lightgray
-    LineColor gray
+    BackgroundColor #EEF2F6
     FontStyle italic
   }
   note {
     BackgroundColor yellow
-    LineColor orange
     FontSize 12
   }
 
@@ -39,18 +34,19 @@ skinparam ranksep 80
   }
 
   sequenceDiagram {
-    Linecolor lightgray
     participant {
-      BackgroundColor lightgray
+      BackgroundColor #EEF2F6
     }
   }
+
   wbsDiagram {
-    Linecolor lightgray
-    node {
-      BackgroundColor lightgray
+    :depth(0) {
+      LineColor #C0D8E8
+      BackgroundColor #C0D8E8
     }
-    arrow {
-      LineColor lightgray
+    :depth(1) {
+      LineColor #D8E5F0
+      BackgroundColor #D8E5F0
     }
   }
   document {