Inside <head> added meta tag

<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">

But despite this. when entering the site from a smartphone with a 480x800px screen (233ppi), I see the styles that are described inside @ media screen and (max-width:320px){...}

Tell me, what is missing or what is superfluous?

By the way, on cssmediaqueries.com the same phone passes the test: @media screen and (max-width: 480px) perfectly

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