Squarespace 7.1 Mobile - How to change product gallery style to "stacked" on mobile?

Add to Design > Custom CSS

@media screen and (max-width:767px) {
.ProductItem-gallery-carousel-controls {
    display: none !important;
}
.ProductItem-gallery-current-slide-indicator {
    display: none;
}
.ProductItem-gallery-slides-item {
    position: static !important;
    height: auto !important;
    width: 100% !important;
    visibility: initial !important;
}
img.ProductItem-gallery-slides-item-image {
    width: 100% !important;
    height: auto !important;
    left: 0 !important;
}
.ProductItem-gallery-slides:before {
    padding-bottom: 0 !important;
}
.ProductItem-gallery-scroll {
    display: none !important;
}
}