css - media query won't take precedence -


i have simple css , html see if media query work. wrong

<!doctype html> <html> <head>     <meta name="viewport" content="width=device-width, initial-scale=1">     <style type="text/css">     .box {         background: red;         width: 100px;         height: 200px     }     /* mobile phones */     @media screen , (max-device-width:640px)  {         .box {             background: blue;         }     }     </style> </head> <body> <div class="box"></div> </body> </html>

the box background won't change blue when viewing in mobile. use firefox plugin "go mobile" simulate mobile screen environment during test

solution: https://jsfiddle.net/r56m37kb/

max-width instead of max-device-width


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