To make Gallery Image move right on hover on Squarespace, you can follow these steps.
#1. First, find Gallery Section ID.
In my example, it is:
section[data-section-id="66e9ea69d23c463c98a03892"]
#2. Next, use this code to Website Tools > Custom CSS.
section[data-section-id="66e9ea69d23c463c98a03892"] figure:hover {
transform: translateX(50px);
transition: all 0.3s;
}
section[data-section-id="66e9ea69d23c463c98a03892"] figure {
transition: all 0.3s;
}