runtime error

Exit code: 1. Reason: Traceback (most recent call last): File "/home/user/app/app.py", line 166, in <module> app = create_game_ui() File "/home/user/app/app.py", line 101, in create_game_ui with gr.Blocks(title="The Elements Crossword Puzzle", css=css) as demo: NameError: name 'css' is not defined

Container logs: