alfresco-ng2-components/lib/core/collapsable/accordion-group.component.html

<div class="adf-panel adf-panel-default" [ngClass]="{'adf-panel-open': isOpen}">
    <div class="adf-panel-heading" [ngClass]="{'adf-panel-heading-selected': isSelected}" (click)="toggleOpen($event)">
        <div id="heading-icon" *ngIf="hasHeadingIcon()" class="adf-panel-heading-icon">
            <mat-icon class="material-icons"
               [matTooltip]="headingIconTooltip"
               [matTooltipDisabled]="!headingIconTooltip">
                {{headingIcon}}
            </mat-icon>
        </div>
        <div id="heading-text" class="adf-panel-heading-text">{{heading}}</div>
        <div id="accordion-button" *ngIf="hasAccordionIcon" class="adf-panel-heading-toggle">
            <i class="material-icons">{{getAccordionIcon()}}</i>
        </div>
    </div>
    <div class="adf-panel-collapse" [hidden]="!isOpen">
        <div class="adf-panel-body" #contentWrapper>
            <ng-content></ng-content>
        </div>
    </div>
</div>