score:2

Accepted answer

This is because now the latest bootstrap refers to v4 in the link https://maxcdn.bootstrapcdn.com/bootstrap/latest/css/bootstrap.min.css

You need to change your link to https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css where you have been including stylesheet most probably /public/index.html or just search through files where you are importing bootstrap from cdn and change it to version 3(3.3.7 in my case), because react-bootstrap(Navs, NavItems or any other components ) uses bootstrap v3 css

score:1

Change this: ]

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/latest/css/bootstrap.min.css">

to not lastes version, for ex.

  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

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