Firefox flexbugs - Percentage padding not taken into account

[mouadennaciri]

I have a div element child of a flexbox layout where the percentage value padding is not taken into account on Firefox.

CodePen:

https://codepen.io/mouadennaciri/pen/WMxEBJ

Is it a flexbug?

[garrettw]

I can see the horizontal padding in effect, but the vertical padding is indeed missing.

[mouadennaciri]

Apparently this is a known problem : https://stackoverflow.com/questions/36783190/why-doesnt-percentage-padding-margin-work-on-flex-items-in-firefox