diff --git a/GDP/D3D9/Window.cpp b/GDP/D3D9/Window.cpp
index 6e2d272..511ba2e 100644
--- a/GDP/D3D9/Window.cpp
+++ b/GDP/D3D9/Window.cpp
@@ -21,14 +21,17 @@ INT Window::init(HINSTANCE hInstance, UINT width, UINT height)
     DWORD style = {};
     style = WS_OVERLAPPEDWINDOW; // window with border & title
     //style = WS_POPUP; // window without any border or title
+
+    RECT rect = { 100, 100, width + 100, height + 100 }; // left top right bottom
+    AdjustWindowRect(&rect, style, FALSE);
     
     // 4. create window instance
     _hWnd = CreateWindow(
         wc.lpszClassName, // class name of window class to be instantiated
         wc.lpszClassName, // window title
         style, // visual style
-        100, 100, // window position (left-top corner)
-        width, height, // window size
+        rect.left, rect.top, // window position (left-top corner)
+        rect.right - rect.left, rect.bottom - rect.top, // window size
         nullptr, // handle to parent window
         nullptr, // handle to menu instance
         hInstance,