.upload_preview{
    max-width: 100%;
}

@media only screen and (max-width: 800px) {
    .popup-box {
      width: 500px !important;
    }
  }
@media only screen and (max-width: 600px) {
    .popup-box {
      width: 400px !important;
    }
  }
@media only screen and (max-width: 500px) {
    .popup-box {
      width: 300px !important;
    }
  }