css - @media query not working in mobile. Works fine in Chrome -

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i trying working somehow not working in mobile. when use chrome tool overrides screen size, works fine. not sure doing wrong. please help

@media screen , (min-device-width : 320px) , (max-device-width : 480px) {             .container .backgroundimage { display: none; } }

enter image description here

there background image when viewed in browser. s remove image when viewed in mobile not working somehow.. please help

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testing on iphone 3g, 4, 5, android galaxy nexus

@andy right, double check device-widths, or use min-width don't have know every device width.

regardless make sure have viewport tag, <meta name="viewport" content="width=device-width,initial-scale=1.0">.


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