<link rel="stylesheet"media="screen and (min-width: 600px)"href="small.css"> <link rel="stylesheet"media="screen and (min-width: 4000px)"href="big.css">
2nd by using Javascript
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if (window.matchMedia('screenand (min-width: 600px)')){ document.write('<link rel="stylesheet" href="small.css">'); }
I suggest for better one you need use only one css file and define the concept like as below :