bootstrap4.css
.was-validated .custom-control-input:valid ~ .custom-control-label, .custom-control-input.is-valid ~ .custom-control-label {
  color: #28a745;
}
bootstrap4.css
.was-validated .custom-control-input:valid ~ .custom-control-label::before, .custom-control-input.is-valid ~ .custom-control-label::before {
  border-color: #28a745;
}
bootstrap4.css
.was-validated .custom-control-input:valid ~ .valid-feedback,
.was-validated .custom-control-input:valid ~ .valid-tooltip, .custom-control-input.is-valid ~ .valid-feedback,
.custom-control-input.is-valid ~ .valid-tooltip {
  display: block;
}
bootstrap4.css
.was-validated .custom-control-input:valid:checked ~ .custom-control-label::before, .custom-control-input.is-valid:checked ~ .custom-control-label::before {
  border-color: #34ce57;
  background-color: #34ce57;
}
bootstrap4.css
.was-validated .custom-control-input:valid:focus ~ .custom-control-label::before, .custom-control-input.is-valid:focus ~ .custom-control-label::before {
  box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}
bootstrap4.css
.was-validated .custom-control-input:valid:focus:not(:checked) ~ .custom-control-label::before, .custom-control-input.is-valid:focus:not(:checked) ~ .custom-control-label::before {
  border-color: #28a745;
}
bootstrap4.css
.was-validated .custom-control-input:invalid ~ .custom-control-label, .custom-control-input.is-invalid ~ .custom-control-label {
  color: #dc3545;
}
bootstrap4.css
.was-validated .custom-control-input:invalid ~ .custom-control-label::before, .custom-control-input.is-invalid ~ .custom-control-label::before {
  border-color: #dc3545;
}
bootstrap4.css
.was-validated .custom-control-input:invalid ~ .invalid-feedback,
.was-validated .custom-control-input:invalid ~ .invalid-tooltip, .custom-control-input.is-invalid ~ .invalid-feedback,
.custom-control-input.is-invalid ~ .invalid-tooltip {
  display: block;
}
bootstrap4.css
.was-validated .custom-control-input:invalid:checked ~ .custom-control-label::before, .custom-control-input.is-invalid:checked ~ .custom-control-label::before {
  border-color: #e4606d;
  background-color: #e4606d;
}
bootstrap4.css
.was-validated .custom-control-input:invalid:focus ~ .custom-control-label::before, .custom-control-input.is-invalid:focus ~ .custom-control-label::before {
  box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}
bootstrap4.css
.was-validated .custom-control-input:invalid:focus:not(:checked) ~ .custom-control-label::before, .custom-control-input.is-invalid:focus:not(:checked) ~ .custom-control-label::before {
  border-color: #dc3545;
}
bootstrap4.css
.custom-control-input {
  position: absolute;
  z-index: -1;
  opacity: 0;
}
bootstrap4.css
.custom-control-input:checked ~ .custom-control-label::before {
  color: #fff;
  border-color: #007bff;
  background-color: #007bff;
}
bootstrap4.css
.custom-control-input:focus ~ .custom-control-label::before {
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}
bootstrap4.css
.custom-control-input:focus:not(:checked) ~ .custom-control-label::before {
  border-color: #80bdff;
}
bootstrap4.css
.custom-control-input:not(:disabled):active ~ .custom-control-label::before {
  color: #fff;
  background-color: #b3d7ff;
  border-color: #b3d7ff;
}
bootstrap4.css
.custom-control-input:disabled ~ .custom-control-label {
  color: #6c757d;
}
bootstrap4.css
.custom-control-input:disabled ~ .custom-control-label::before {
  background-color: #e9ecef;
}
bootstrap4.css
.custom-checkbox .custom-control-input:indeterminate ~ .custom-control-label::before {
  border-color: #007bff;
  background-color: #007bff;
}
bootstrap4.css
.custom-checkbox .custom-control-input:disabled:checked ~ .custom-control-label::before {
  background-color: rgba(0, 123, 255, 0.5);
}
bootstrap4.css
.custom-checkbox .custom-control-input:disabled:indeterminate ~ .custom-control-label::before {
  background-color: rgba(0, 123, 255, 0.5);
}
bootstrap4.css
.custom-radio .custom-control-input:disabled:checked ~ .custom-control-label::before {
  background-color: rgba(0, 123, 255, 0.5);
}
bootstrap4.css
.custom-switch .custom-control-input:checked ~ .custom-control-label::after {
  background-color: #fff;
  -webkit-transform: translateX(0.75rem);
  transform: translateX(0.75rem);
}
bootstrap4.css
.custom-switch .custom-control-input:disabled:checked ~ .custom-control-label::before {
  background-color: rgba(0, 123, 255, 0.5);
}
■フォーム:form-group:コンポーネント:カスタムフォームのチェックボックスに不確定(indeterminate)を指定する

  <form>
    <!-- カスタムフォームのチェックボックス -->
    <div class="custom-control custom-checkbox mb-3">
      <input type="checkbox" class="custom-control-input" id="checkbox08" checked>
      <label class="custom-control-label" for="checkbox08">選択済み</label>
    </div>
    <div class="custom-control custom-checkbox mb-3">
      <input type="checkbox" class="custom-control-input" id="checkbox09" unchecked>
      <label class="custom-control-label" for="checkbox09">未選択</label>
    </div>
    <div class="custom-control custom-checkbox mb-3">
      <input type="checkbox" class="custom-control-input indeterminate-box" id="checkbox10">
      <label class="custom-control-label" for="checkbox10">不確定</label>
    </div>
  </form>
■フォーム:form-group:コンポーネント:カスタムフォームのチェックボックスとラジオボタンを無効にする

  <form>
    <!-- チェックボックスを無効にする -->
    <div class="custom-control custom-checkbox">
      <input type="checkbox" class="custom-control-input" id="checkbox11" disabled>
      <label class="custom-control-label" for="checkbox11">
        チェック(無効)
      </label>
    </div>
    <!-- ラジオボタンを無効にする -->
    <div class="custom-control custom-radio">
      <input type="radio" name="radioDisabled" id="checkbox12" class="custom-control-input" disabled>
      <label class="custom-control-label" for="checkbox12">
        オプション(無効)
      </label>
    </div>
  </form>
■フォーム:form-group:コンポーネント:カスタムフォームのチェックボックスとラジオボタンを作成する

  <form>
    <!-- カスタムフォームのチェックボックス -->
    <div class="custom-control custom-checkbox mb-3">
      <input type="checkbox" class="custom-control-input" id="checkbox13">
      <label class="custom-control-label" for="checkbox13">チェックする</label>
    </div>
    <!-- カスタムフォームのラジオボタン -->
    <div class="custom-control custom-radio">
      <input type="radio" id="option1" name="option" class="custom-control-input">
      <label class="custom-control-label" for="option1">オプション1</label>
    </div>
    <div class="custom-control custom-radio">
      <input type="radio" id="option2" name="option" class="custom-control-input">
      <label class="custom-control-label" for="option2">オプション2</label>
    </div>
  </form>