Adding scroll animations for gallery page images

Is there a way to add animations to the gallery page images as you scroll down. Just a simple fade in/out so it doesn't feel so choppy scrolling down as the images load on my site https://jasonkim.com

Using the site wide animation feature only works on the text in the gallery but not the images.

Here's an example of what I'm kind of looking for but can be just a basic fade:

https://wakawaka.world/furniture

Much appreciated!! 

You mean Images under Jason Kim text on Homepage?

Add to Design > Custom CSS

a.grid-item {
    transition: all 0.3s ease;
    transform: translateY(0);
}
a.grid-item:hover {
    transition: all 0.3s ease;
    transform: translateY(-30px);
}