How do target a class inside a specific div

Site URL: https://instoreexperience.com/ourproducts

Im trying to make hover states on a gallery grid, but the only way I can get it to work is:
 

.gallery-grid-item:hover{
  opacity: .5 !important;

}

The issue is I use gallery grid images throughout the site. Ideally id like to just target the gallery class inside the div, but that wasnt working for me. I was trying:

#block-6138dc007192cb11bb8c2a7b.gallery-grid-item:hover{
  opacity: .5 !important;}

Any idea the proper way of doing this?

If I understand correctly you are trying to apply your effect to images of particular galleries.

One way to target your gallery is the following.

[data-section-id="6138dc007192cb11bb8c2a7b"] .gallery-grid-item:hover {

  opacity : 0.5;
  
  }

This is for a v7.1 and specific to the posters need.

To find data section ids check out Heather Tovey's most excellent looking Squarespace ID Finder.

Let us know how it goes.

That's it! Thank you!