Extra div when injecting HTML inside container

Hi, peeps o/ A little help here u.u
So, there's an extra div been inserted around the new .country div that I don't know where it's coming from.
I was looking at the JS code but didn't see anything different from other projects where I inserted code like that.
Can someone enlightening me ? maybe I'm too blind .-.

LIVE: https://rwxganta.github.io/country-flags/
https://github.com/rwxganta/country-flags
extra-div.png
GitHub
Practice API requests with XMLhttprequest while getting some country infos - GitHub - rwxganta/country-flags: Practice API requests with XMLhttprequest while getting some country infos
GitHub - rwxganta/country-flags: Practice API requests with XMLhttp...
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