html - IE Flexbox - Child Element does not stretch when using min-height on parent -

please have @ pen:

what should make red .section element fill blue .container element. works in chrome , ff, not in ie.

when setting height instead of min-height, works, need min-height because contained elements might exceed increase size of container.

is there way make work?

to fix that, needed wrap min-height element in flexbox row.

not beautiful because have add element "styling", works.

Plus Code