I thought that to apply this to the other lists, I just needed to remove the #wpsp-5189 from the CSS you provided.
After removing #wpsp-5189
look for this CSS:
@media (min-width: 1025px)
.wp-show-posts-image img {
height: 100%;
width: 100%;
object-fit: cover;
position: absolute;
top: 0;
left: 0;
}
Change object-fit: cover;
to object-fit: cover !important;
and see if it works.