It's usually an OS setting you should turn on (e.g. chrome on Windows will activate prefers-color-scheme: dark if you have dark theme turned on in your Windows settings)
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Looks like normal as usual on my mobile browser. What kind of browser that support this CSS mode?
Here is the browser support caniuse.com/#feat=prefers-color-sc...
It's usually an OS setting you should turn on (e.g. chrome on Windows will activate prefers-color-scheme: dark if you have dark theme turned on in your Windows settings)