diff --git a/Bin/net40/SunnyUI.Demo.exe b/Bin/net40/SunnyUI.Demo.exe
index 67d177e7..ef569974 100644
Binary files a/Bin/net40/SunnyUI.Demo.exe and b/Bin/net40/SunnyUI.Demo.exe differ
diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index cef7a68d..5a9164cb 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/SunnyUI.dll b/Bin/net5.0-windows/SunnyUI.dll
index 8b70fa19..bc5f215f 100644
Binary files a/Bin/net5.0-windows/SunnyUI.dll and b/Bin/net5.0-windows/SunnyUI.dll differ
diff --git a/Bin/netcoreapp3.1/SunnyUI.dll b/Bin/netcoreapp3.1/SunnyUI.dll
index 586631cc..2e776e29 100644
Binary files a/Bin/netcoreapp3.1/SunnyUI.dll and b/Bin/netcoreapp3.1/SunnyUI.dll differ
diff --git a/SunnyUI/Controls/UINavMenu.cs b/SunnyUI/Controls/UINavMenu.cs
index 60a9e77e..fa5dfc63 100644
--- a/SunnyUI/Controls/UINavMenu.cs
+++ b/SunnyUI/Controls/UINavMenu.cs
@@ -460,7 +460,7 @@ namespace Sunny.UI
             }
         }
 
-        private Color secondBackColor = UIColor.Blue;
+        private Color secondBackColor = Color.FromArgb(66, 66, 66);
 
         [DefaultValue(typeof(Color), "66, 66, 66")]
         [Description("二级节点背景颜色"), Category("SunnyUI")]