The problem is your css isn't loading for the bootstrap components. If you add this in the header of your index.html where your serving your React app it should look correct. I see that you are trying to add the min.css to the App. Not sure why that isn't working, but this will work.

<link rel="stylesheet" href="" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">


Instead of importing react-bootstrap try importing react-tabs and react-tabs.css. Following this link solved my issue.

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