diff --git a/src/themes/theme-forest.js b/src/themes/theme-forest.js
index be1402762..3d15ed740 100644
--- a/src/themes/theme-forest.js
+++ b/src/themes/theme-forest.js
@@ -1,3 +1,4 @@
+import { darken } from 'khroma';
 class Theme {
   constructor() {
     /* Base vales */
@@ -78,7 +79,7 @@ class Theme {
 
     /* Sequence Diagram variables */
 
-    this.actorBorder = this.border1;
+    this.actorBorder = darken(this.mainBkg, 20);
     this.actorBkg = this.mainBkg;
     this.labelBoxBkgColor = this.actorBkg;
     this.labelTextColor = this.actorTextColor;
diff --git a/src/themes/theme-neutral.js b/src/themes/theme-neutral.js
index 3efbfc8bb..540089b9e 100644
--- a/src/themes/theme-neutral.js
+++ b/src/themes/theme-neutral.js
@@ -93,7 +93,7 @@ class Theme {
 
     /* Sequence Diagram variables */
 
-    this.actorBorder = this.border1;
+    this.actorBorder = lighten(this.border1, 23);
     this.actorBkg = this.mainBkg;
     this.actorTextColor = this.text;
     this.actorLineColor = this.lineColor;