.modal-dialog {
  position: relative;
  width: auto;
  max-width: 600px;
  margin: 10px;
}
.modal-sm {
  max-width: 300px;
}
.modal-lg {
  max-width: 95%;
}
.modal-lg2 {
  max-width: 75%;
}
@media (min-width: 768px) {
  .modal-dialog {
    margin: 30px auto;
  }
}
@media (min-width: 320px) {
  .modal-sm {
    margin-right: auto;
    margin-left: auto;
  }
}
@media (min-width: 620px) {
  .modal-dialog {
    margin-right: auto;
    margin-left: auto;
  }
  .modal-lg {
    margin-right: 10px;
    margin-left: 10px;
  }
}
@media (min-width: 920px) {
  .modal-lg {
    margin-right: auto;
    margin-left: auto;
  }
}