Is there a way to force popper to be appended to a different element, e.g.: document.body? It's causing problems when it's required to render datepicker within a fixed container

It's not issue with z-index. Lame workaround for this particular case would be to set main "left" container's overflow to visible, but then it become non-scrollable vertically. Not much of a workaround.
I think if popper was allowed to be attached to any element in DOM hierarchy, this wouldn't be an issue
found solution: https://github.com/Hacker0x01/react-datepicker/pull/1074
sample: https://codesandbox.io/s/1ozy5ol5vl
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Most helpful comment
found solution: https://github.com/Hacker0x01/react-datepicker/pull/1074
sample: https://codesandbox.io/s/1ozy5ol5vl