Add overlay to Gallery Slideshow block

Hello!

I'm using Brine and would love to add an overlay to a Gallery Block in Slideshow mode.  I believe it needs to be done with CSS, but I just *cannot* figure out the selectors/code.  I've tried playing with the opacity but it just turns things white and I actually want to darken it up.  I'd also love to shrink the vertical size of the main slideshow but no luck their either.

Sadly, I can't share the site because it's a not-yet-released app 😞

My bad code....

/* Trying to style overlay of slideshow 
.sqs-video-wrapper, .slide .sqs-gallery-design-stacked-slide .loaded {
  height: 50vh !important;
  background-color: #27241D;
  opacity: .95 !important;
} */

Any help at all would be greatly precipitated!

Can you share link to gallery slideshow on your site? I can take a look

(don't remember slideshow class..)