Fixing submit button ? - What wind.surf will do ?

app.py

@@ -132,7 +132,16 @@ with gr.Blocks() as demo:
             placeholder="Type your message here...",
             lines=1
         )
-        submit = gr.Button("Submit")
+    
+    with gr.Row():
+        _ = gr.Button(value="", visible=False, scale=4)  # Spacer
+        submit = gr.Button(
+            "Submit",
+            variant="primary",
+            scale=2,
+            size="lg"
+        )
+        _ = gr.Button(value="", visible=False, scale=4)  # Spacer
     
     with gr.Accordion("Additional Inputs", open=False):
         model_selector = gr.Dropdown(