Update app.py

app.py

@@ -7,7 +7,8 @@ def apply_circle_mask(image_path):
     image.add(image.image(href=image_path, size=("100%", "100%")))
     
     # Add circular mask
-    width, height = image.viewbox[2:]
+    viewbox = image.viewbox()
+    width, height = viewbox[2], viewbox[3]
     half_x, half_y = width/2, height/2
     line_color = "white"
     mask = image.defs.add(image.mask(id="bg_wrapper"))