Code blocks with no specified language/syntax are unreadable in light mode

[davep]

The following code:

from textual.app        import App, ComposeResult
from textual.containers import VerticalScroll
from textual.widgets    import Header, Footer, Markdown

MARKDOWN = """\
# Hello world!

Here is some Python code in a code block:

```python
def hello() -> str:
    return "Hello!"
```

Here is some plain text in a code block:

```
Hello!
```

"""
class MDCodeBlocksApp( App[ None ] ):

    def compose( self ) -> ComposeResult:
        yield Header()
        with VerticalScroll():
            yield Markdown( MARKDOWN )
        yield Footer()

    def on_mount( self ) -> None:
        self.dark = False

if __name__ == "__main__":
    MDCodeBlocksApp().run()

results in this:

Note how code blocks are always a dark background but in light mode the text for the block with no syntax inverts the text colour. Here's the same code but with the one true mode:

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