Update app.py

app.py

@@ -45,7 +45,7 @@ class MPGPoster(Base):
         self,
         *,
         spacing_size: sizes.Size | str = sizes.spacing_md,
-        radius_size: sizes.Size | str = 0,  # Set radius size to 0 for hard edges sizes.radius_md,
+        radius_size: sizes.Size | str = sizes.Size( 0, 0, 0, 0, 0, 0, 0, 0), # Set radius size to 0 for hard edges sizes.radius_md,
         text_size: sizes.Size | str = sizes.text_lg,
         font: fonts.Font
         | str