Add style param to Widget render method

docs/examples/timers/clock.py

@@ -10,7 +10,7 @@ class Clock(Widget):
     def on_mount(self):
         self.set_interval(1, self.refresh)
 
-    def render(self):
+    def render(self, styles: Styles):
         time = datetime.now().strftime("%c")
         return Align.center(time, vertical="middle")
 

docs/examples/widgets/custom.py

@@ -9,7 +9,7 @@ class Hover(Widget):
 
     mouse_over = Reactive(False)
 
-    def render(self) -> Panel:
+    def render(self, styles: Styles) -> Panel:
         return Panel("Hello [b]World[/b]", style=("on red" if self.mouse_over else ""))
 
     def on_enter(self) -> None: