Update app.py

app.py

@@ -67,14 +67,26 @@ def sysml_chatbot(message, history):
 # Gradio UI
 with gr.Blocks() as demo:
     gr.Markdown("## SysModeler Chatbot")
-    chatbot = gr.Chatbot()
-    msg = gr.Textbox(placeholder="Ask me about SysML diagrams or concepts...")
+
+    chatbot = gr.Chatbot(height=500)
+    
+    with gr.Row():
+        with gr.Column(scale=8):
+            msg = gr.Textbox(
+                placeholder="Ask me about SysML diagrams or concepts...",
+                lines=3,
+                show_label=False
+            )
+        with gr.Column(scale=1, min_width=80):
+            submit_btn = gr.Button("➤")
+
     clear = gr.Button("Clear")
 
     state = gr.State(history)
 
-    msg.submit(sysml_chatbot, [msg, state], [msg, chatbot])
-    clear.click(lambda: ([], ""), None, [chatbot, msg])
+    submit_btn.click(fn=sysml_chatbot, inputs=[msg, state], outputs=[msg, chatbot])
+    msg.submit(fn=sysml_chatbot, inputs=[msg, state], outputs=[msg, chatbot])  # still supports enter key
+    clear.click(fn=lambda: ([], ""), inputs=None, outputs=[chatbot, msg])
 
 if __name__ == "__main__":
     demo.launch()