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 @hello: "utf-8";
 @charset @hello;
 
 @-moz-document url-prefix(){
         div {
                 color: red;
         }
 }
 
 @page :left { margin-left: 4cm; }
 @page :right { margin-left: 3cm; }
 @page { margin: 2cm }
 
 @-ms-viewport {
     width: device-width;
 }
 @-moz-viewport {
     width: device-width;
 }
 @-o-viewport {
     width: device-width;
 }
 @viewport {
     width: device-width;
 }