如何在ng-multiselect-dropdown Angular 7中将选中的文本和复选框蓝色更改为灰色

.ng-dropdown-panel .ng-dropdown-panel-items .ng-option.ng-option-selected .ng-option-label,
.ng-dropdown-panel .ng-dropdown-panel-items .ng-option.ng-option-selected .ng-option-checkbox {
  color: gray !important;
}

<ng-multiselect-dropdown
  [data]="dropdownData"
  [(ngModel)]="selectedItems"
  [settings]="dropdownSettings"
  ngClass="custom-dropdown"
></ng-multiselect-dropdown>

.custom-dropdown .ng-dropdown-panel {
  background-color: #fff;
  border: 1px solid #ccc;
  color: #333;
}

.custom-dropdown .ng-dropdown-panel .ng-dropdown-panel-items .ng-option.ng-option-selected .ng-option-label,
.custom-dropdown .ng-dropdown-panel .ng-dropdown-panel-items .ng-option.ng-option-selected .ng-option-checkbox {
  color: gray !important;
}