https://www.encodedna.com/angular/how-to-show-hide-or-toggle-elements-in-angular-4.htm

<button (click)="toggle()" id="bt">
    {{buttonName}}
</button>

<ng-container *ngIf="show">
    <div style="margin: 0 auto;text-align: left;">
        <div>
            <label>Name:</label>
            <div><input id="tbname" name="yourname" /></div>
        </div>
        <div>
            <label>Email Address:</label>
            <div><input name="email" id="email" /></div></div>
        <div>
            <label>Additional Information (optional):</label>
            <div><textarea rows="5" cols="46"></textarea></div>
        </div>
    </div>
</ng-container>