.modal-fullscreen {
  background: transparent;
}
.modal-fullscreen .modal-content {
  background: transparent;
  border: 0;
  -webkit-box-shadow: none;
  box-shadow: none;
} 
.modal-fullscreen .modal-dialog {
  margin: 0;
  margin-right: auto;
  margin-left: auto;
  width: 100%;
}

.img-responsive.enlarge {
  margin-left: auto;
  margin-right: auto;
}