Update app.py

app.py

@@ -74,7 +74,7 @@ css = """
     border: 1px solid #ccc;
     border-radius: 20px;
     overflow: hidden;
-    background: url('https://path-to-your-phone-background-image.png') no-repeat center center;
+    background: url('https://huggingface.co/spaces/peterkros/child-safe-chatbot/blob/main/iPhone-mob.png') no-repeat center center;
     background-size: cover;
     height: 700px;
 }