An IE 11 Flexbox min-height bug workaround
You may have run into this “flexbug” on Philip Walton’s excellent list of odd and frustrating Flexbox bugs, this one is currently bug #3. He offers a solution which uses viewport heights and nested containers, but those approaches did not work for my problem. Below is a solution I found to my specific implementation that may be helpful to you.
In my case, I had a button which used a min-height to ensure uniformity but not a set height in order to accommodate wrapping text.
I found that IE 11 would correctly align the flex items IF there was something inside which it could measure. In order to give it something to measure I am including a pseudo-element with a height set to match the min-height of the flex container. This provides for no visible change but gives IE enough information to correctly layout the flex items.
If this helps you I would love to know about it. Hit me up on Twitter @kmuncie!
See the Pen IE11 Flexbox Bug Workaround by Kevin Muncie (@kmuncie) on CodePen.