Hi,

Try to replace previous custom code with this one:

.product-grid-item .wd-add-btn .by-vendor-name-link,
.product-grid-item .wd-add-btn .by-vendor-name-link:hover{
	background-color:transparent;
	color:#333333;
	box-shadow:none;
}

.product-list-item .wd-add-btn .by-vendor-name-link {
	margin-bottom: 5px
}

Kind Regards