ngx-admin/src/app/theme/sidebar/sidebar.html

<aside class="al-sidebar">
  <ul class="al-sidebar-list">
    <li *ngFor="#item of menuItems" class="al-sidebar-list-item"
        [ngClass]="{'selected': item.selected, 'with-sub-menu': item.subMenu}">

      <a *ngIf="!item.subMenu" href="{{ item.root }}" class="al-sidebar-list-link">
        <i class="{{ item.icon }}"></i><span>{{ item.title }}</span>
      </a>

      <a *ngIf="item.subMenu" ng-mouseenter="hoverItem($event, item)" (click)="toggleSubMenu($event, item)" class="al-sidebar-list-link" href>
        <i class="{{ item.icon }}"></i><span>{{ item.title }}</span>
        <b class="fa" [ngClass]="{'fa-angle-up': item.expanded, 'fa-angle-down': !item.expanded}" *ngIf="item.subMenu"></b>
      </a>

    </li>
  </ul>
  <div class="sidebar-hover-elem"></div>
</aside>