diff --git a/src/toggle.ts b/src/toggle.ts
index 5e1959b..cbcac7c 100644
--- a/src/toggle.ts
+++ b/src/toggle.ts
@@ -33,6 +33,6 @@ export class MapButton extends Control {
         this.showingOrtho = !this.showingOrtho
         firstLayer.setVisible(!this.showingOrtho)
         secondLayer.setVisible(this.showingOrtho)
-        thirdLayer.setOpacity(this.showingOrtho ? 0.5 : 1)
+        thirdLayer.setOpacity(this.showingOrtho ? 0.2 : 1)
     }
 }