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

please have @ pen:

http://codepen.io/anon/pen/zyzlmg

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.

http://s.codepen.io/boomerang/cf5b323f92549ea4b9e9aa3afcee9fc41427899803437/index.html#https://github.com/philipwalton/flexbugs#3-min-height-on-a-column-flex-container-wont-apply-to-its-flex-items

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