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Hi! I can't set style of Flex container correctly. When I choose another Predefined style with another backgrounds color in Flex container there is no any result except white background.

Here is the shots:

I set the style with dark background:
https://cloud.mail.ru/public/BuuT/QaHvXqzNH
https://cloud.mail.ru/public/9QmF/bMyRtiqbQ

Builder shows me correct color of the style:
https://cloud.mail.ru/public/BkSW/hec24V3yh

And after publication there is white background:
https://cloud.mail.ru/public/KHeb/PhFBvyrf2

My settings:
https://cloud.mail.ru/public/4Q4B/TZGVxzZcj

I have tried this myself and it works for me.
Can you please share the project file so I can see all your settings?

See this related FAQ:
viewtopic.php?f=10&t=82134

Here is the project file: https://cloud.mail.ru/public/MM11/vkiDjsx2G

The reason why it does not work is because the flex container is a form. In that case global styles will not be applied.
I will investigate if this can be implemented in a future update.