Update app.py

app.py

@@ -167,6 +167,12 @@ if __name__ == "__main__":
         padding: 20px;
         min-height: 600px;
     }
+
+    /* Gradio 5.x renders the image drop-zone with border-style:dashed via
+       the .placeholder class.  Override to match the original solid look. */
+    .placeholder {
+        border-style: solid !important;
+    }
     """
 
     with gr.Blocks(