diff --git a/src/main/java/cz/kamma/kfmanager/ui/MainWindow.java b/src/main/java/cz/kamma/kfmanager/ui/MainWindow.java
index 34748af..91fc033 100644
--- a/src/main/java/cz/kamma/kfmanager/ui/MainWindow.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/MainWindow.java
@@ -960,11 +960,17 @@ public class MainWindow extends JFrame {
         Color selColor = config.getSelectionColor();
         if (selColor == null) selColor = new Color(184, 207, 229);
         
-        // Active panel uses selection color, inactive panel uses a very dark gray border
-        Color inactiveColor = new Color(45, 45, 45);
+        // Inactive indicator is more subtle (darker)
+        Color inactiveColor = new Color(60, 60, 60);
         
-        leftPanel.setBorder(BorderFactory.createLineBorder(activePanel == leftPanel ? selColor : inactiveColor, 2));
-        rightPanel.setBorder(BorderFactory.createLineBorder(activePanel == rightPanel ? selColor : inactiveColor, 2));
+        // We use a MatteBorder to create a "strip" only on the top edge
+        leftPanel.setBorder(BorderFactory.createCompoundBorder(
+                BorderFactory.createMatteBorder(3, 0, 0, 0, activePanel == leftPanel ? selColor : inactiveColor),
+                BorderFactory.createEmptyBorder(3, 5, 5, 5)));
+        
+        rightPanel.setBorder(BorderFactory.createCompoundBorder(
+                BorderFactory.createMatteBorder(3, 0, 0, 0, activePanel == rightPanel ? selColor : inactiveColor),
+                BorderFactory.createEmptyBorder(3, 5, 5, 5)));
     }
     
     /**