@media only screen and (max-width: 1400px) {

    .big_screen{
     display:none !important;
    }

    .medium_screen{
        display: block;
    }

  .productimg{
    width:600px;
  }

}


@media only screen and (max-width: 1200px) {


  .productimg{
    width:500px;
  }

}


@media only screen and (max-width: 1000px) {

  .productimg{
    width:400px;
  }

}