Since 30 March 2020 StackOverflow started to offer a dark theme version (still in beta) for their logged-in users. They came up with an official announcement on their home page:
“You’ve been asking for dark mode for years. The dark mode beta is finally here. Change your preferences any time.”
More and More web apps are offering or considering to offer a “dark mode” layout to their visitors that comes together with their normal, “light mode” layout.
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