How do you set alternating colors in the list of topics

[Canapin (Coin-coin le Canapin)]

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No specific class for dark mode

Continuing the discussion from How to add a specific body class for the dark (or light) mode?: Is this still the case? I’d like to add specific CSS for an external widget (a leaflet map) when dealing with a dark theme, is it still not possible to identify using just a CSS selector? Of course I can just create a Theme Component to apply the changes and assume the admin just adds that to the Dark Scheme, but that won’t switch automatically … (which is the current solution)