Your contribution cannot be approved because it does not follow the Utopian Rules.

• The content of this tutorial is very simple and only shows a few very basic examples. Someone wanting to learn about Flexbox is much better of going here.
• The linked repository is not the official repository for Flexbox, but simply a repository that "showcases problems once hard or impossible to solve with CSS alone, now made trivially easy with Flexbox." The official repository for Flexbox can be found here, and you can check our whitelist for unofficial repositories here.

I suggest that in the future you make your tutorials more in-depth, and also link to the correct, official repository.

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[utopian-moderator]