GM_addStyle with dynamic class name?

I have an Website which contains something like this:

<div class="yqCWmB">
   <img referrerpolicy="unsafe-url" src="//www.golem.de/1903/sp_Vllz-744275_rc.jpg" style="position: fixed; top: 87px;">
</div>

where this "yqCWmB" in the class name is dynamically created.

When I use: GM_addStyle(".'yqCWmB' {visibility: hidden !important; }"); that element is hidden, but next time that class name is something like "zCNfYMo" and the element is not hidden anymore. How can I search for that dynamic class name? I'm using this in an Greasemonkey Script.

That <img referrerpolicy="unsafe-url" inside the DIV is always the same, maybe find somehow with that?

Thanks a lot!

You can use referrerpolicy attribute along with its value to hide the div.

Working snippet:

$(document).find('img[referrerpolicy="unsafe-url"]').closest('div').hide();

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="yqCWmB">
   <img referrerpolicy="unsafe-url" src="//www.golem.de/1903/sp_Vllz-744275_rc.jpg" style="position: fixed; top: 87px;">
   <p>Hey</p>
</div>

Output: