How can I have add to cart button display on hover

-- HikaShop version -- : 2.4.0
-- Joomla version -- : 2.5.28
-- PHP version -- : 5.4.36
-- Browser(s) name and version -- : Firefox 37.0.1

I was looking at the Hikashop demo website and I noticed when I hovered over the product image, the add to cart and add to wishlist buttons would pop up upon hover. How can I do this?

I've added the following to the Front-end CSS file:

.hikashop_products_listing_main .hikashop_subcontainer:hover .product-content .hikashop_product_stock .hikashop_cart_input_button {
	visibility: hidden;
	top: 38%;
	opacity: 1;
	filter: alpha(opacity=100);
	-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
	visibility: visible;
}