@media (max-width: 640px) {
  #modalContent {
    position: fixed !important;
    top: 12% !important;
    bottom: 12% !important;
    right: 4% !important;
    left: 4% !important;
  }
  /* Limit max width to 1000px */
  div.ctools-modal-content {
    width: 100% !important;
    margin: 0 auto;
    max-width: 1000px;
  }
  div.ctools-modal-content .modal-content {

    width: 100% !important;
  }
}