Unable to change the background color of CompletionsMenu

In the current implementation of CompletionsMenu class, there is no option to change the style of a container. Because of this limitation, I cannot change the background color of the CompletionMenu.

Inprompt_toolkit/layout/menus.py:

class CompletionsMenu(ConditionalContainer):
    # NOTE: We use a pretty big z_index by default. Menus are supposed to be
    #       above anything else. We also want to make sure that the content is
    #       visible at the point where we draw this menu.
    def __init__(
        self,
        max_height: Optional[int] = None,
        scroll_offset: Union[int, Callable[[], int]] = 0,
        extra_filter: FilterOrBool = True,
        display_arrows: FilterOrBool = False,
        z_index: int = 10 ** 8,
    ) -> None:

I'd appreciate if someone who has run into this before and could provide a workaround for now.

Thanks!

Start in prompt_toolkit/layout/menus.py at the CompletionsMenu constructor and inspect how its container styling is currently configured. Add a way to customize the menu container so callers can change its background color, then verify that the completions menu renders with the supplied styling.