How to import device width based CSS file?

To specifically call a stylesheet you need to use the link tag in your HTML, see the below 
Try the below  

<link rel="stylesheet" type="text/css" media="screen and (min-width: 701px) and (max-width: 900px)" href="css/medium.css" />
                                                          (OR)

<link rel="stylesheet" type="text/css" media="only screen and (max-device-width: 780px)" href="max-device-width-780px.css" />

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