Is there a Custom CSS I can use to make REEL Galleries have Fading animation??

Hello Is there a Custom CSS I can apply to Make this REEL Gallery I am using to display my work, have Fading animation like the other Galleries have options to do?

I have to use the Reel Gallery cause when trying the other Gallery options it caused bigger issues like either lower resolution on mobile display, or cropped the images. The Reel Gallery option solved all that, and Im definitely sticking with it even if i can't get the fading.

But I do love that fading animation option the other galleries had, and would love to know if I could apply that somehow to this

(Here's a Link one of my reel galleries Im using:)

https://www.kappacomics.com/ch03_scene01