As mentioned in commit b7f6c4c43:
> [In Internet Explorer] the `flex: 1` property doesn't work so well
> when `flex-direction` is set to `column`. We're replacing it with
> `flex-grow: 1`. No need to set other `flex-basis` nor `flex-shrink`
> since in this case the default values will work just fine.
0652d3f52d