def on_mount(self) -> None:
        """Configure the help screen once the DOM is ready."""
        # It seems that some things inside Markdown can still grab focus;
        # which might not be right. Let's ensure that can't happen here.
        self.query_one(Markdown).can_focus_children = False
        self.query_one("Vertical > VerticalScroll").focus()
Configure the help screen once the DOM is ready.
frogmouth/dialogs/help_dialog.py