Hi mindjigsaw,

This is a customization question and support doesn't offer customization services as we wrote on our documentation homepage. I will try to help you this time though

Can you please send us an URL where a sample button is and tell us exactly which button is that.

Hi,

Paste the following code to your Custom CSS to remove the underline from the buttons.

.woocommerce .product.catalog-layout-default .item-info .product-loop-add-to-cart-container a:hover:after {
    display: none;
}