
@media
only screen and (-webkit-min-device-pixel-ratio: 2) and (max-width: 991px),
only screen and (   min--moz-device-pixel-ratio: 2) and (max-width: 991px),
only screen and (     -o-min-device-pixel-ratio: 2/1) and (max-width: 991px),
only screen and (        min-device-pixel-ratio: 2) and (max-width: 991px),
only screen and (                min-resolution: 192dpi) and (max-width: 991px),
only screen and (                min-resolution: 2dppx) and (max-width: 991px) {
  -webkit-font-smoothing: subpixel-antialiased;
  .btn-main{font-size:8px;}
}