diff --git a/manimlib/mobject/frame.py b/manimlib/mobject/frame.py
index fc496695..8e4d6c84 100644
--- a/manimlib/mobject/frame.py
+++ b/manimlib/mobject/frame.py
@@ -1,51 +1,56 @@
+from __future__ import annotations
+
 from manimlib.constants import BLACK, GREY_E
 from manimlib.constants import FRAME_HEIGHT
 from manimlib.mobject.geometry import Rectangle
 from manimlib.utils.config_ops import digest_config
 
+from typing import TYPE_CHECKING
+if TYPE_CHECKING:
+    from manimlib.constants import ManimColor
+
 
 class ScreenRectangle(Rectangle):
-    CONFIG = {
-        "aspect_ratio": 16.0 / 9.0,
-        "height": 4
-    }
-
-    def __init__(self, **kwargs):
-        Rectangle.__init__(self, **kwargs)
-        self.set_width(
-            self.aspect_ratio * self.get_height(),
-            stretch=True
+    def __init__(
+        self,
+        aspect_ratio: float = 16.0 / 9.0,
+        height: float = 4,
+        **kwargs
+    ):
+        super().__init__(
+            width=aspect_ratio * height,
+            height=height,
+            **kwargs
         )
 
 
 class FullScreenRectangle(ScreenRectangle):
-    CONFIG = {
-        "height": FRAME_HEIGHT,
-        "fill_color": GREY_E,
-        "fill_opacity": 1,
-        "stroke_width": 0,
-    }
+    def __init__(
+        self,
+        height: float = FRAME_HEIGHT,
+        fill_color: ManimColor = GREY_E,
+        fill_opacity: float = 1,
+        stroke_width: float = 0,
+        **kwargs,
+    ):
+        super().__init__(
+            height=height,
+            fill_color=fill_color,
+            fill_opacity=fill_opacity,
+            stroke_width=stroke_width,
+        )
 
 
 class FullScreenFadeRectangle(FullScreenRectangle):
-    CONFIG = {
-        "stroke_width": 0,
-        "fill_color": BLACK,
-        "fill_opacity": 0.7,
-    }
-
-
-class PictureInPictureFrame(Rectangle):
-    CONFIG = {
-        "height": 3,
-        "aspect_ratio": 16.0 / 9.0
-    }
-
-    def __init__(self, **kwargs):
-        digest_config(self, kwargs)
-        Rectangle.__init__(
-            self,
-            width=self.aspect_ratio * self.height,
-            height=self.height,
-            **kwargs
+    def __init__(
+        self,
+        stroke_width: float = 0.0,
+        fill_color: ManimColor = BLACK,
+        fill_opacity: float = 0.7,
+        **kwargs,
+    ):
+        super().__init__(
+            stroke_width=stroke_width,
+            fill_color=fill_color,
+            fill_opacity=fill_opacity,
         )