Flex justify content equally distanced items

from blog Muffin Man, | ↗ original
I want to share a hack (or a trick if you prefer) my colleague Marko showed me today. What is the problem? We want our flex items to be equally distanced between each other and from the parent's edge. Unforunately space-evenly (I wasn't aware of this property, thanks Marc for mentioning it in the comment below.) is not supported in IE and Edge....