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Hi!
Thanks for your post and sorry for the trouble!
You are on the right track, with the CSS code from https://tablepress.org/faq/remove-borders-from-a-table/ 🙂 Now just apply the changes that are described directly under the code on that page and the border will disappear (in particular, use .tablepress instead of .tablepress-id-N).
Regards,
Tobias