support for '@' symbol in dark mode

I have chosen Python in Gutenberg editor. In python i have used '@' symbol as decorator in the code.
and I have used dark mode.
while displaying '@mock' background and font end text both becoming dark, So can not see the code in the browser.

@mock.patch("mock_function.randint", return_value=2, autospec=True)
def test_mock(v):
assert abc(2) == 4

Reproduce the issue in the Gutenberg editor with the provided Python decorator snippet while dark mode is enabled, then inspect the syntax-highlighting styles that affect the @mock text. Done means the decorator and surrounding code remain readable with sufficient contrast in dark mode.

Written by the indexing model from the issue text.