Reduce space/margin between product stacked images to zero

Hello 

I am using square space 7.1. I been trying to remove space between the stacked images on the product page. I tried a few codes but non of them worked. Please find the details below. Thank you in advance 

Add to Website > Website Tools > Custom CSS

/* Stacked Product */
@media screen and (min-width:768px) {
.tweak-product-basic-item-gallery-design-stacked .ProductItem-gallery-slides-item {
    margin-bottom: 0px !important;
}
.tweak-products-width-full .products.collection-content-wrapper {
    padding-top: 0 !important;
    padding-left: 0 !important;
}
nav.ProductItem-nav {
    position: absolute;
    left: 3vw;
    z-index: 99999;
    background-color: white;
    padding: 0 !important;
}}