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How to make a Treehouse social icon?

Hi, everyone!! Today, I was wondering how to make Treehouse social icon, I dont know the question is allow or not, but if the question is allow to ask, then I will post this question to Treehouse. If not you can tell me and I will delete the question immediately.

I saw many people using image or svg, but either way, I dont know how to do. Because for the image there is border around the icon, for svg, I still cant find the file.

So, if you can help me, I really appreciated, thank you so much!!