.modal-middle {
  z-index: -1050;
  display: block !important;
  overflow-x: hidden;
}

.modal-middle.in {
  z-index: 1050;
}

.modal-middle.modal-middle-short .modal-dialog {
  position: absolute;
  left: 50%;
  top: 50%;
}

.modal-middle.modal-middle-short .modal-content {
  position: relative;
  left: -50%;
}

@media screen and (max-width: 768px) {
  .modal-middle.modal-middle-short .modal-dialog {
    width: 100%;
    margin-left: -10px;
    padding: 10px;
  }
}