matsen-tool-fe/matsen-tool/src/app/_components/toggle/toggle.component.html

<div class="toggle-component">
    <div class="toggle collapsed" data-bs-toggle="collapse" [attr.data-bs-target]="'#collapse-' + toggleId"
         aria-expanded="false">
        <h2>{{ headline }}</h2>
    </div>
    <div class="collapse" id="collapse-{{ toggleId }}">
        <ng-content></ng-content>
    </div>
</div>