css changes

app.py

@@ -81,8 +81,15 @@ def run(ref_path, ref_style, ref_prompt, prompt1, prompt2, prompt3):
 
     return images_a
 
-with gr.Blocks() as demo:
-    with gr. Column():
+css = """
+#col-container{
+    margin: 0 auto;
+    max-width: 720px;
+}
+"""
+
+with gr.Blocks(css=css) as demo:
+    with gr. Column(elem_id="col-container"):
         gr.HTML("""
         <h2 style="text-align: center;">Google's StyleAligned Transfer</h2>
         """