Reply To: sold by" background is missing in product grid"

Hello,

Please try adding the following Custom CSS in the Global Custom CSS area under Theme Settings >> Custom CSS.

.product-grid-item .wd-add-btn .by-vendor-name-link, .product-grid-item .wd-add-btn .by-vendor-name-link:hover {
    background-color: rgb(96 149 160 / 87%) !important;
}

Regards.
Xtemos Studios