diff --git a/Source/UI/Chat/UIWhisperWnd.h b/Source/UI/Chat/UIWhisperWnd.h
index 819e87f..e7847bb 100644
--- a/Source/UI/Chat/UIWhisperWnd.h
+++ b/Source/UI/Chat/UIWhisperWnd.h
@@ -17,6 +17,7 @@ public:
   void Paint() override;
   void Slot26(int x, int y) override;
   void Slot33(int x, int y) override;
+  void Slot43() override;
 
 protected:
   UIButtonContext* m_controls;
diff --git a/Source/UI/Window/UIWindow.h b/Source/UI/Window/UIWindow.h
index 616516d..4161832 100644
--- a/Source/UI/Window/UIWindow.h
+++ b/Source/UI/Window/UIWindow.h
@@ -29,6 +29,7 @@ struct SpriteRleImage;
 struct SpriteFrameCell;
 class CBitmapRes;
 class CActRes;
+class TextureCache;
 struct WindowReplayRecorder;
 
 struct UIWindowContext {
@@ -41,6 +42,7 @@ struct UIWindowContext {
   WindowRegistration& registration;
   UIWindowMgr& windowMgr;
   std::unordered_set<UIWindow*>& deferredDeletion;
+  TextureCache& textures;
 
   void DestroyDeferredChildren();
 };
diff --git a/Source/UI/WindowOverlay.cpp b/Source/UI/WindowOverlay.cpp
new file mode 100644
index 0000000..6dfe7a7
--- /dev/null
+++ b/Source/UI/WindowOverlay.cpp
@@ -0,0 +1,20 @@
+#include "Render/Primitives/AlphaRectangle.h"
+#include "Render/Renderer.h"
+#include "Render/TextureQuad.h"
+#include "UI/Chat/UIWhisperWnd.h"
+
+// OFFSET: 0x008D0DB0
+// FUNCTION: fn_12091
+void UIWhisperWnd::Slot43() {
+  int x = 0;
+  int y = 0;
+  this->ToScreen(x, y);
+  DrawAlphaRectangle(
+    g_renderer->primitives, this->m_context->textures, g_renderer->queues, x + 1, y + 1, this->geometry.width - 2, this->geometry.height, 0x66000000,
+    g_renderer->fog.supported != 0, g_depthStart, g_depthEnd
+  );
+  DrawAlphaRectangle(
+    g_renderer->primitives, this->m_context->textures, g_renderer->queues, x + 1, y + 1, this->geometry.width - 2, 17, 0x449EB6E4,
+    g_renderer->fog.supported != 0, g_depthStart, g_depthEnd
+  );
+}
diff --git a/data/compile.json b/data/compile.json
index ed52efb..032233d 100644
--- a/data/compile.json
+++ b/data/compile.json
@@ -700,6 +700,7 @@
   "Source/UI/Window/WindowRetirement.cpp": 2,
   "Source/UI/WindowBackground.cpp": 2,
   "Source/UI/WindowLowerBorder.cpp": 2,
+  "Source/UI/WindowOverlay.cpp": 2,
   "Source/UI/WindowSprite.cpp": 2,
   "Source/UI/WindowTitlebar.cpp": 2,
   "Source/Utility/AES.cpp": 0,