@media only screen and (min-width : 320px) and (max-width : 359px) { }
@media only screen and (min-width : 360px) and (max-width : 480px) { }
@media only screen and (min-width : 480px) and (max-width : 640px) { }
@media only screen and (min-width : 640px) and (max-width : 769px) { }
@media only screen and (min-width : 769px) and (max-width : 1025px) { }
@media only screen and (min-width : 1025px) and (max-width : 1280px) { }
@media only screen and (min-width : 1280px) and (max-width : 1367px) {
  .slider img {
      height:450px!important;
  }

 }