update button layout

app.py

@@ -152,7 +152,7 @@ def retry_last_answer(
           
     if chat and history:
         # Removing the previous conversation from chat 
-        chat.pop(-1)
+        chatbot.pop(-1)
         # Removing bot response from the history 
         history.pop(-1)
         # Setting up a flag to capture a retry 
@@ -202,9 +202,10 @@ with gr.Blocks(theme=gr.themes.Soft()) as demo:
                     container=False)
                 RETRY_FLAG = gr.Checkbox(value=False, visible=False)
             with gr.Column(min_width=32, scale=1):
-                submitBtn = gr.Button("Submit", variant="primary")
-                deleteBtn = gr.Button("Delete last turn", variant="secondary")
-                retryBtn = gr.Button("Regenerate", variant="secondary")
+                with gr.Row():
+                    submitBtn = gr.Button("Submit", variant="primary")
+                    deleteBtn = gr.Button("Delete last turn", variant="secondary")
+                    retryBtn = gr.Button("Regenerate", variant="secondary")
         with gr.Column(scale=1):
             emptyBtn = gr.Button("Clear History")
             max_length = gr.Slider(0, 32768, value=8192/2, step=1.0, label="Maximum length", interactive=True)