Fix Quiz dark mode

[seohyonkim]

Here I fixed the background colour of the quizzes in dark mode! Please merge if it looks good. Thank you!

[review-notebook-app]

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[Zethson]

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/site-packages/jupyter_book/pdf.py", line 37, in _html_to_pdf
    from playwright.async_api import async_playwright, expect
ModuleNotFoundError: No module named 'playwright'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.13.2/x64/bin/jupyter-book", line 10, in <module>
    sys.exit(main())
             ~~~~^^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/site-packages/click/core.py", line 1161, in __call__
    return self.main(*args, **kwargs)
           ~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/site-packages/click/core.py", line 1082, in main
    rv = self.invoke(ctx)
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/site-packages/click/core.py", line 1697, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/site-packages/click/core.py", line 1443, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/site-packages/click/core.py", line 788, in invoke
    return __callback(*args, **kwargs)
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/site-packages/jupyter_book/cli/main.py", line 317, in build
    builder_specific_actions(
    ~~~~~~~~~~~~~~~~~~~~~~~~^
        result, builder, OUTPUT_PATH, build_type, PAGE_NAME, click.echo
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/site-packages/jupyter_book/cli/main.py", line 578, in builder_specific_actions
    html_to_pdf(output_path.joinpath("index.html"), path_pdf_output)
    ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/site-packages/jupyter_book/pdf.py", line 32, in html_to_pdf
    asyncio.run(_html_to_pdf(html_file, pdf_file))
    ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/asyncio/runners.py", line 195, in run
    return runner.run(main)
           ~~~~~~~~~~^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/site-packages/jupyter_book/pdf.py", line 39, in _html_to_pdf
    _error(
    ~~~~~~^
        "Generating PDF from book HTML requires the playwright package. "
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        "Install it first.",
        ^^^^^^^^^^^^^^^^^^^^
        ImportError,
        ^^^^^^^^^^^^
    )
    ^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/site-packages/jupyter_book/utils.py", line 48, in _error
    raise kind(box)
ImportError: 

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[Zethson]

Thank you!