Thumbnails on Pedigree Map page rather small and without CSS class

[reteP-riS]

I like the thumbnails on the right side of the Pedigree Map page, but (from my point of view) they are rather small (height:40px; width:50px) and cannot be styled via the CSS and JS module with a different size because they are missing a CSS class (while the icon-silhouettes have a CSS class). It seems to me the _buildMapData function produces this code, but I couldn't find the respective module code.

Example for a person with a thumbnail:

<div class="d-none d-lg-block">
<a class="gallery"
   type="image/jpeg"
   href="https://webtrees.example.com/tree/myTree/media-download?xref=M416&fact_id=3427656abf64cb7024bbe451f008ac&disposition=inline&mark=0"
   data-title="Portrait Grandma">
<img dir="auto"
     src="https://webtrees.example.com/tree/myTree/media-thumbnail?xref=M416&fact_id=3427656abf64cb7024bbe451f008ac&w=40&h=50&fit=crop&mark=0&s=743a657a1ef7c4da6d1fd9ec7faf70"
  srcset="https://webtrees.example.com/tree/myTree/media-thumbnail?xref=M416&fact_id=3427656abf64cb7024bbe451f008ac&w=80&h=100&fit=crop&mark=0&s=95b97f477f485ecbefdac0cf06952d 2x,
          https://webtrees.example.com/tree/myTree/media-thumbnail?xref=M416&fact_id=3427656abf64cb7024bbe451f008ac&w=120&h=150&fit=crop&mark=0&s=5211aa53822d97160e9e94a89b8e17 3x,
          https://webtrees.example.com/tree/myTree/media-thumbnail?xref=M416&fact_id=3427656abf64cb7024bbe451f008ac&w=160&h=200&fit=crop&mark=0&s=2689e659aeda8a680c4ab4072cd7f4 4x"
          alt="Portrait Grandma"></a>
</div>

Example for a person without thumbnail and consequently a silhouette:

<div class="d-none d-lg-block">
  <i class="icon-silhouette icon-silhouette-m wt-icon-flip-rtl">
  </i>
</div>

The first example results in a 40x50 pixel thumbnail that cannot be styled and doesn't use the different sizes suggested by the srcset.

It would be great if you could add a CCS class to this line
<img dir="auto" src="https://webtrees.example.com/tree/myTree/media-thumbnail ...
with something like this:
<img class="wt-chart-box-thumbnail" dir="auto" src="https://webtrees.example.com/tree/myTree/media-thumbnail ...

[ric2016]

The custom module re-uses code from the original webtrees PedigreeMapModule module, which I'm reluctant to drill down into.

The images (or silhouettes) are created here. I think the missing css class should be added by webtrees core code (this may be useful elsewhere). I suggest creating a webtrees issue for this. I'll reconsider in case webtrees refuses to address this.

[reteP-riS]

Thanks for your reply and the time you spent on this!
I'll create a new issue with webtrees.