flex-shrink

@media (min-width: 576px) {
  .form-inline label {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    -ms-flex-pack: center;
    justify-content: center;
    margin-bottom: 0;
  }
  .form-inline .form-group {
    display: -ms-flexbox;
    display: flex;
    -ms-flex: 0 0 auto;
    flex: 0 0 auto;
    -ms-flex-flow: row wrap;
    flex-flow: row wrap;
    -ms-flex-align: center;
    align-items: center;
    margin-bottom: 0;
  }
  .form-inline .form-control {
    display: inline-block;
    width: auto;
    vertical-align: middle;
  }
  .form-inline .form-control-plaintext {
    display: inline-block;
  }
  .form-inline .input-group,
  .form-inline .custom-select {
    width: auto;
  }
  .form-inline .form-check {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    -ms-flex-pack: center;
    justify-content: center;
    width: auto;
    padding-left: 0;
  }
  .form-inline .form-check-input {
    position: relative;
    -ms-flex-negative: 0;
    flex-shrink: 0;
    margin-top: 0;
    margin-right: 0.25rem;
    margin-left: 0;
  }
  .form-inline .custom-control {
    -ms-flex-align: center;
    align-items: center;
    -ms-flex-pack: center;
    justify-content: center;
  }
  .form-inline .custom-control-label {
    margin-bottom: 0;
  }
}

.modal-dialog-scrollable .modal-header,
.modal-dialog-scrollable .modal-footer {
  -ms-flex-negative: 0;
  flex-shrink: 0;
}

.flex-shrink-0 {
  -ms-flex-negative: 0 !important;
  flex-shrink: 0 !important;
}

.flex-shrink-1 {
  -ms-flex-negative: 1 !important;
  flex-shrink: 1 !important;
}