Fixed syntax error

app.py

@@ -568,7 +568,7 @@ def update_use_embeddings(widget, state):
         return state
 
 
-with gr.Blocks(theme='darkhuggingface', css=".gradio-container {background-color: #090c17}" as block: # #gr-component {background-color: #202937; border-color: #384253; color: #bcc0c6}") as block:
+with gr.Blocks(theme='darkhuggingface', css=".gradio-container {background-color: #090c17}") as block: # #gr-component {background-color: #202937; border-color: #384253; color: #bcc0c6}") as block:
     llm_state = gr.State()
     history_state = gr.State()
     chain_state = gr.State()