lottery/resources/scss/base/plugins/forms/form-validation.scss

@import '../../bootstrap-extended/include'; // Bootstrap includes
@import '../../components/include'; // Components includes

form {
  span.error {
    width: 100%;
    font-size: 0.857rem;
  }
  .error:not(input) {
    color: $danger;
  }
  input.error,
  input.error:focus {
    border-color: $danger !important;
    ~ .custom-control-label::before,
    ~ .custom-file-label {
      border-color: $danger !important;
    }
    ~ .custom-control-label {
      color: $danger;
    }
  }
  .form-group {
    .custom-control-input.error {
      cursor: pointer;
      & {
        ~ .custom-control-label:before {
          border-color: $danger !important;
        }
      }
    }
  }
  textarea.error {
    border-color: $danger !important;
  }
  .select2.error {
    + .select2-container--classic .select2-selection--single,
    + .select2-container--default .select2-selection--single,
    + .select2-container--classic .select2-selection--multiple,
    + .select2-container--default .select2-selection--multiple {
      border-color: $danger !important;
    }
  }
}