Appointment Blue with Woocommerce

I am using Appointment Blue theme with WooCommerce.

The issue is that WooCommerce works well with other themes.

Unfortunately, with the Appointment Blue Theme, it displays the sale price using white text on a white background.

As an example see https://www.travelideology.com/product-category/brands/victorinox/

If you select under the strikethrough price you will see that there is another price showing that is in white on white background.

How can I fix this?

Regards
Bruce