.modal {
  text-align: center;
  padding: 0 !important;
}
.modal:before {
  content: "";
  display: inline-block;
  height: 100%;
  vertical-align: middle;
  margin-right: -4px;
}
.modal-dialog {
  display: inline-block;
  text-align: left;
  vertical-align: middle;
}