Bootstrap Navbar 'toggler' doesn't respond

I don’t have a clue, why it doesn’t work. I copied it straight from bootstrap 4 documentation. Do I need to use .container-fluid, .row and .col-xx-xx

P.S To make toggler appear, you should make your browser windows smaller or use responsive mode

You need to include jQuery and Bootstrap js source files in Codepen. It works just fine after that :+1:

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