Let the chat area fill the available height

app.py

@@ -65,7 +65,15 @@ with gr.Blocks(fill_height=True, fill_width=True) as demo:
         "**After the fix**: the chart stays put and the view stays pinned to the bottom."
     )
 
-    chatbot = gr.Chatbot(label="Chatbot", elem_id="chatbot", height=200)
+    # scale + fill_height is what lets the chat area grow; height alone would pin it
+    # to 200px and the 600px bokeh chart would barely fit in the viewport.
+    chatbot = gr.Chatbot(
+        label="Chatbot",
+        elem_id="chatbot",
+        scale=5,
+        height=200,
+        min_width=200,
+    )
 
     with gr.Group():
         with gr.Row():