Hello,
Added below custom to child theme style.css
.template-content .content-product .quantity-wrapper .button {
font-size: 12px;
padding: 0 15px;
}
.template-content .content-product .quantity-wrapper .button:before {
content: '';
}
and overwrote /wp-content/themes/xstore-child/woocommerce/content-product-slider.php and /wp-content/themes/xstore-child/woocommerce/content-product.php files.
Check now.
Regards