How do you have 100% height and width without overflow or whitespace?

Continuing the discussion from Display full page (width and height) and without a scroll bar:

The Question

How can a user make a background that is 100% height and width, regardless of device?


This must be possible, because the Popup element has a background (mostly transparent by default) that resizes to 100% on any device and centers whatever group it is showing.

I’m starting this thread hoping that this issue can be answered so that new users can easily find the answer. I do note there are several related threads, but often they have special use cases like this one…

and are outdated like this…

I’ll try to link others to this topic if we do come up with an authoritative answer. Many thanks!

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