Activate dark mode in https://web.whatsapp.com/
< Opiniones de dark_mode_whatsappweb
Yes, this colors are applied by the default WhatsApp dark colors like in mobile app. I'm apply a css rule(dark mode maybe is a future feature on WhatsApp Web) on html and not change default dark colors.
Firefox 77.0b9 (64-bit), Microsoft Windows 10.0.18363.836, WhatsApp Messenger (Beta) 2.20.157 - OK. However, it is a pity that the topic is dark, not black. That is, the predominant colors are dirty green, gray.