fix css

app.py

@@ -132,6 +132,8 @@ example_triples = [
      "Change the clothing of the person in the first image to match the attire shown in the second image, ensuring the details of the dress, including the blue bodice, white blouse, and the overall rustic aesthetic, are faithfully replicated."]
 ]
 
+css = """ #col-container { margin: 0 auto; max-width: 640px; } """
+
 with gr.Blocks(css=css) as demo:
     with gr.Column(elem_id="col-container"):
         gr.Markdown("# Multi Ref Edit Demo")