[root]

morning ahmad

use this code :

.woocommerce div.products.buttonsappearunder div.product, .woocommerce.wc-shortcode.carousel:not(.no-gutter) div.products.buttonsappearunder div.product {
    margin: -0.5px!important;
    border: 1px solid #999999 !important;
}

I edit this code on your website and seems in Desktop and mobile border now shown border