iphone - CSS Media Queries - Having Trouble making it work -

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i have following css, including media query iphone users, not seem work:

body { background: url('background.png') no-repeat center center fixed; background-size:100%; }  #tab { width:30%; height:60%; position:fixed; background: url('tab.png') no-repeat center center fixed; background-size:33%; top:20%; left:35%; opacity:0.7; }  @media screen , (max-device-width: 480px)  { body { background:#1589ff; }  #tab { width:30%; height:60%; position:fixed; background: url('tab.png') no-repeat center center fixed; background-size:33%; top:20%; left:35%; } }

the normal css works fine, design not alter when switching iphone. can suggest why above media query not seem working? missing something?

instead:

@media screen , (max-device-width: 480px)

try:

@media (max-width: 480px)  or   @media screen , (max-width: 480px)

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