AdminLTE/scss/dark/bootstrap/forms/_form-check.scss

// Check/radio

.form-check-input {
  background-color: $form-check-input-bg-alt;
  border: $form-check-input-border-alt;

  &:active {
    filter: $form-check-input-active-filter-alt;
  }

  &:focus {
    border-color: $form-check-input-focus-border-alt;
    box-shadow: $form-check-input-focus-box-shadow-alt;
  }

  &:checked {
    background-color: $form-check-input-checked-bg-color-alt;
    border-color: $form-check-input-checked-border-color-alt;

    &[type="checkbox"] {
      @if $enable-gradients {
        background-image: escape-svg($form-check-input-checked-bg-image-alt), var(--#{$variable-prefix}gradient);
      } @else {
        background-image: escape-svg($form-check-input-checked-bg-image-alt);
      }
    }

    &[type="radio"] {
      @if $enable-gradients {
        background-image: escape-svg($form-check-radio-checked-bg-image-alt), var(--#{$variable-prefix}gradient);
      } @else {
        background-image: escape-svg($form-check-radio-checked-bg-image-alt);
      }
    }
  }

  &[type="checkbox"]:indeterminate {
    background-color: $form-check-input-indeterminate-bg-color-alt;
    border-color: $form-check-input-indeterminate-border-color-alt;

    @if $enable-gradients {
      background-image: escape-svg($form-check-input-indeterminate-bg-image-alt), var(--#{$variable-prefix}gradient);
    } @else {
      background-image: escape-svg($form-check-input-indeterminate-bg-image-alt);
    }
  }

  &:disabled {
    opacity: $form-check-input-disabled-opacity-alt;
  }

  // Use disabled attribute in addition of :disabled pseudo-class
  &[disabled],
  &:disabled {
    ~ .form-check-label {
      opacity: $form-check-label-disabled-opacity-alt;
    }
  }
}

.form-check-label {
  color: $form-check-label-color-alt;
}

// Switch

.form-switch {

  .form-check-input {
    background-image: escape-svg($form-switch-bg-image-alt);

    &:focus {
      background-image: escape-svg($form-switch-focus-bg-image-alt);
    }

    &:checked {
      @if $enable-gradients {
        background-image: escape-svg($form-switch-checked-bg-image-alt), var(--#{$variable-prefix}gradient);
      } @else {
        background-image: escape-svg($form-switch-checked-bg-image-alt);
      }
    }
  }
}

.btn-check {
  &[disabled],
  &:disabled {
    + .btn {
      opacity: $form-check-btn-check-disabled-opacity-alt;
    }
  }
}