Why is mobile adaptation not working? and with a narrow screen there is no hamburger?

Question

Adaptive design

Everything works here >>> https://codepen.io/organizedchaos/pen/rwlhd
It doesn't work for me((( >>> https://www.bn53.ru/
Why?

Answer 1

Apparently, little works there at all.

Well, if you look at the path to resources, it’s not at all clear what result is expected

. I would recommend the author not to poke around in the page until they give an answer, otherwise this is pointing a finger at the sky