invert color when selecting bookmark

frontend/ui/reader/readerbookmark.lua

@@ -73,13 +73,21 @@ function ReaderBookmark:onShowBookmark()
 		end
 		v.text = "Page "..page.." "..v.notes.." @ "..v.datetime
 	end
+	
+	local menu_container = CenterContainer:new{
+		dimen = Screen:getSize(),
+	}
 
 	local bm_menu = Menu:new{
 		title = "Bookmarks",
 		item_table = self.bookmarks,
 		width = Screen:getWidth()-50,
 		height = Screen:getHeight()-50,
+		show_parent = menu_container,
 	}
+	
+	table.insert(menu_container, bm_menu)
+	
 	-- buid up menu widget method as closure
 	local doc = self.ui.document
 	local view = self.view
@@ -96,10 +104,6 @@ function ReaderBookmark:onShowBookmark()
 		end
 	end
 
-	local menu_container = CenterContainer:new{
-		dimen = Screen:getSize(),
-		bm_menu,
-	}
 	bm_menu.close_callback = function()
 		UIManager:close(menu_container)
 	end