Hi Sandy,
Use this css. .wmle_container .wmle_item .wmle_woocommerce_box .wlme_add_to_cart .added_to_cart{ color:#OTHER COLOR CODE#; text-decoration:none; font-size:12px;}
#OTHER COLOR CODE# Don’t use #FFFFFF here. FFFFFF means white. Please use other color and it will start working.
Regarding the tick icon, those css comes from wooCommerce’s css and not from our plugin. So far i don’t think that you have enabled css of wooCommerce.
Thanks