Why do smartphones display the site incorrectly?

Question

Layout

I also use it on the computer when the windows are resized, everything is displayed normally, but smartphones see the site as if it is open on the desktop, what could be the problem?
@media screen and (max-width: 960px)

Answer 1

viewport?

Answer 2

<meta name="viewport" content="width=device-width, initial-scale=1">

Probably forgot to add to head

Answer 3

Try

<meta name="viewport" content="width=device-width, initial-scale=1">

put it in the head tag