Table Borders in review-order (checkout form page)

Good afternoon.

I can’t see the review-order table well in checkout page.

Could you tell where to find this to mend it, please?

(I haven’t changed your theme style.css and I haven’t added anything related with this table in my child theme style.css)

Picture attached (marks and borders I need to change to transparent color are signed in red)

Thanks in advance.

Regards,

Pat.