Why the xiaomi browser and opera colors somehow distorted and made others?

Can these browsers need something else to prescribe? Here provided screenshots of how it looks in Yandex blue and how it looks in the browser, all white:
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April 4th 20 at 00:32
1 answer
April 4th 20 at 00:34
Just add as a fallback for those browsers that do not hold a gradient background:

background-color: #141936;

And the gradient set using background-image.

More detail on CSS-tricks.
Solved the problem, it turned out that the night mode Opera changed color - alayna85 commented on April 4th 20 at 00:37

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