Some scrollbar color styles have no effect

[rodrigogiraoserrao]

The rules scrollbar_background_active and scrollbar_color_hover do not affect the way a scrollbar looks like.

Run the app below and notice that you can't make the scrollbar background red when you drag it, nor can you turn the thumb pink when you hover it.

from textual.app import App
from textual.widgets import Label

TEXT = """I must not fear.
Fear is the mind-killer.
Fear is the little-death that brings total obliteration.
I will face my fear.
I will permit it to pass over me and through me.
And when it has gone past, I will turn the inner eye to see its path.
Where the fear has gone there will be nothing. Only I will remain.
"""

_CSS = """
Screen {
    scrollbar-background-active: red;
    scrollbar-background-hover: purple;
    scrollbar-color-active: yellow;
    scrollbar-color-hover: pink;
}
"""

class ScrollbarActiveApp(App):
    CSS = _CSS
    def compose(self):
        yield Label(TEXT * 10)

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