/* iphone 3 */
  @media only screen and (min-device-width: 320px) and (max-device-height: 480px) and (-webkit-device-pixel-ratio: 1) { 
     
      }

  /* iphone 4 */
  @media only screen and (min-device-width: 320px) and (max-device-height: 480px) and (-webkit-device-pixel-ratio: 2) {
      
     }
  /* iphone 5 */
  @media only screen and (min-device-width: 320px) and (max-device-height: 568px) and (-webkit-device-pixel-ratio: 2) { 
        
    }
  /* iphone 6, 6s, 7, 8 */
  @media only screen and (min-device-width: 375px) and (max-device-height: 667px) and (-webkit-device-pixel-ratio: 2) { 
       
     }

  /* iphone 6+, 6s+, 7+, 8+ */
  @media only screen and (min-device-width: 414px) and (max-device-height: 736px) and (-webkit-device-pixel-ratio: 3) {
      
     }
  /* iphone X , XS, 11 Pro */
  @media only screen and (min-device-width: 375px) and (max-device-height: 812px) and (-webkit-device-pixel-ratio: 3) {
      
  }
  /* iphone XR, 11 */
  @media only screen and (min-device-width : 414px) and (max-device-height : 896px) and (-webkit-device-pixel-ratio : 2) {
     
   }
 /* iphone XS Max, 11 Pro Max */
  @media only screen and (min-device-width : 414px) and (max-device-height : 896px) and (-webkit-device-pixel-ratio : 3) {
       
   }