Dark themes come and go these days. For example, Android, iOS and Windows they now also have a dark mode, while the majority of new applications that are released also have a dark appearance.
It seems that Google is also preparing a dark mode for it machine searchs, in an effort to provide more consistency to n-enabled devices mode dark matter.
So, the company recently started testing the dark mode in Google Search on Android devices.
The dark feature on Google.com is only available for the browser Google Chrome and comes with an experimental flag for now. Logically after the tests, it will be released for all mobile devices.
It remains to be seen if the dark mode of Google.com will reach the desktops at some point. Of course, it will take some time for the tests to be completed, but apparently everything will darken sooner or later.