new code

src/interface.py

@@ -3,7 +3,7 @@ import gradio as gr
 # Gradio application setup
 def create_demo():
 
-    with gr.Blocks(title="RAG Chatbot Q&A", theme="huggingface_dark") as demo:
+    with gr.Blocks(title="RAG Chatbot Q&A", theme="Soft",css=".gradio-container {background-color: black}") as demo:
         with gr.Column():
             with gr.Row():
                 chat_history = gr.Chatbot(value=[], elem_id='chatbot', height=680)