.post-type-archive-product.woocommerce ul.products li.product .button.product_type_variable.add_to_cart_button, .post-type-archive-product.woocommerce ul.products li.product .button.product_type_simple.add_to_cart_button, .post-type-archive-product.woocommerce ul.products li.product .button.product_type_external {
    font-size: 13px !important;
    letter-spacing: 1px;
    font-weight: bold !important;
    padding: 10px 20px;
    border-radius: 5px !important;
    color: #fff !important;
    background-color: #6dd568 !important;
    border-width: 0px !important;
}