clr-angular-static-fix/emphasis/alert/alert.html

1. Install Clarity Icons package through npm:

<!--
  ~ Copyright (c) 2016-2018 VMware, Inc. All Rights Reserved.
  ~ This software is released under MIT license.
  ~ The full license information can be found in LICENSE in the root directory of this project.
  -->

<div
    *ngIf="!_closed"
    class="alert"
    [ngClass]="alertClass"
    [class.alert-hidden]="isHidden"
    [class.alert-sm]="isSmall"
    [class.alert-app-level]="isAppLevel">
    <div class="alert-items">
        <ng-content></ng-content>
    </div>
    <button type="button" class="close" aria-label="Close" *ngIf="closable" (click)="close()">
        <clr-icon aria-hidden="true" shape="close"></clr-icon>
    </button>
</div>