Reply To: How to do this app-layout without media queries?

[Oskar]

I should of course have mentioned that users will be able to resize the width and height of .container. So unfortunately I can’t set a fixed height on any children.

Flex-basis+grow works nicely for the layout. Thank you. Just need it to overflow below 25em now..

Updated version: https://codepen.io/anon/pen/eRaRYo