Fix button background color rendering, Cannot Find BGCOLOR symbol anywhere

gui/widgets/buttons.py

@@ -55,7 +55,7 @@ class Button(Widget):
         h = self.height
         if not self.visible:  # erase the button
             display.usegrey(False)
-            display.fill_rect(x, y, w, h, BGCOLOR)
+            display.fill_rect(x, y, w, h, self.bgcolor)
             return
         super().show()  # Blank rectangle containing button
         if self.shape == CIRCLE:  # Button coords are of top left corner of bounding box