ipsos-components/src/lib/expansion/expansion-panel.html

Material Design components for Angular

<ng-content select="mat-expansion-panel-header"></ng-content>
<div [class.mat-expanded]="expanded" class="mat-expansion-panel-content"
     [@bodyExpansion]="_getExpandedState()" [id]="id">
  <div class="mat-expansion-panel-body">
    <ng-content></ng-content>
  </div>
  <ng-content select="mat-action-row"></ng-content>
</div>