.btn btn-primary * { visibility: hidden; } is not working

I want to hide few buttons to print so i am using .btn btn-primary * { visibility: hidden; } code but it is not working still button are showing in print Html code is

<div id="control" style="display: none">                  <button class="btn btn-primary" onclick="toEmail()">Send to Mail</button>&nbsp;<button onclick="window.print();" class="btn btn-warning">Send to PDF</button>                </div>    

https://stackoverflow.com/questions/66558127/btn-btn-primary-visibility-hidden-is-not-working March 10, 2021 at 11:55AM