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As far as I know, css does not support gradient backgrounds transition, but supports "flat" color transition, for example (background-color:#fff)
How this effect was applied here, then? https://stripe.com/
I was able to reproduce the effect by placing one of the colors of the transparent gradient, and a background of a color just behind, thus transitioned the background color behind, but the effect is not the same.
I tried to understand using the developer tools, unsuccessfully.