如何在Angular 4中更改引导模式内容的背景色

我想更改模式内容的引导模型背景色，但我无法更改模式内容背景色，请帮助我

<app-asset></app-asset>
</modal-content>
<modal-footer >
  <button type="button" class="btn btn-default cancel-button" (click)="addModel.close()">{{'SHARED.Actions.cancel' | translate}}</button>
  <!-- <button type="button" class="btn btn-primary yes-button" (click)="ManagePublishNews(newsItem.id,false);addModel.close()">{{'SHARED.Actions.confirm' | translate}}</button> -->
</modal-footer>

{{'MEDIA_PAGE.MEDIA_materials_title'| translate}}

<app-asset></app-asset>
</modal-content>
<modal-footer >
  <button type="button" class="btn btn-default cancel-button" (click)="addModel.close()">{{'SHARED.Actions.cancel' | translate}}</button>
  <!-- <button type="button" class="btn btn-primary yes-button" (click)="ManagePublishNews(newsItem.id,false);addModel.close()">{{'SHARED.Actions.confirm' | translate}}</button> -->
</modal-footer>

{{'SHARED.Actions.cancel'| translate}}

---

您可以像这样向html添加样式

<app-asset></app-asset>
</modal-content>
<modal-footer >
  <button type="button" class="btn btn-default cancel-button" (click)="addModel.close()">{{'SHARED.Actions.cancel' | translate}}</button>
  <!-- <button type="button" class="btn btn-primary yes-button" (click)="ManagePublishNews(newsItem.id,false);addModel.close()">{{'SHARED.Actions.confirm' | translate}}</button> -->
</modal-footer>

<modal-content style="background-color:red;">  </modal-content>

---

您可以像这样向html添加样式

<app-asset></app-asset>
</modal-content>
<modal-footer >
  <button type="button" class="btn btn-default cancel-button" (click)="addModel.close()">{{'SHARED.Actions.cancel' | translate}}</button>
  <!-- <button type="button" class="btn btn-primary yes-button" (click)="ManagePublishNews(newsItem.id,false);addModel.close()">{{'SHARED.Actions.confirm' | translate}}</button> -->
</modal-footer>

<modal-content style="background-color:red;">  </modal-content>

---

只需覆盖该元素的CSS并使用！CSS后的重要关键字，以确保其覆盖。 例如：

<app-asset></app-asset>
</modal-content>
<modal-footer >
  <button type="button" class="btn btn-default cancel-button" (click)="addModel.close()">{{'SHARED.Actions.cancel' | translate}}</button>
  <!-- <button type="button" class="btn btn-primary yes-button" (click)="ManagePublishNews(newsItem.id,false);addModel.close()">{{'SHARED.Actions.confirm' | translate}}</button> -->
</modal-footer>

---

只需要覆盖该元素的CSS并使用！CSS后的重要关键字，以确保其覆盖。 例如：

<app-asset></app-asset>
</modal-content>
<modal-footer >
  <button type="button" class="btn btn-default cancel-button" (click)="addModel.close()">{{'SHARED.Actions.cancel' | translate}}</button>
  <!-- <button type="button" class="btn btn-primary yes-button" (click)="ManagePublishNews(newsItem.id,false);addModel.close()">{{'SHARED.Actions.confirm' | translate}}</button> -->
</modal-footer>