Hello, @TFS,
1- Now, in order to solve your issue simply go to the Dashboard >> XStore >> Theme Options >> WooCommerce >> Shop Elements >> Sales & out of stock & New from there you will be able to change the color see the image: https://postimg.cc/dZjxYH7M
2- In order to solve your issue simply go to the Dashboard >> XStore >> Theme Options >> Theme Custom CSS >> Global and paste the below code at the bottom of the CSS box there.
.price ins .amount{color:red !important;}
del{color:black !important;}
Then save settings and check back to your site after clearing the browser cache. The result will appear like this: https://postimg.cc/cK9cWq4G
Regards 8Themes Team.