Adaptive bg img

@media (min-resolution: @retina-dpi), (min-resolution: @retina-dppx) {
      background-image: url("img/bg-header@2x.jpg");
      background-size: 1338px auto;
    }
    
@media (min-width: 768px) and (min-resolution: 144dpi),
       (min-width: 768px) and (min-resolution: 1.5dppx) {
  .page-header__logo {
    background-image: url("img/bg-header@2x.jpg");
    background-size: 1338px auto;
  }
}