Finished my TwitchTV app. Critics are welcome)

Code Feedback
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I would appreciate any suggestions about color, text and others.

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You haven’t implemented this user story:

I will see a placeholder notification if a streamer has closed their Twitch account (or the account never existed). You can verify this works by adding brunofin and comster404 to your array of Twitch streamers.

Check https://coolors.co/ for color schemes.
Blue links on red background doesn’t look good.

And I’m just curious, but why you used Babel as JS preprocessor?

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Thank you for critics and for advice!
I use ES6 and for this I need Babel (In future I will try to replace callbacks with promises)