Can’t create border around table

Hi,
I am trying to create borders around my table, but I can only get one horizontal line going across.
I’ve played with the CSS to no avail.
I am wondering what I could be doing wrong.

My site is PolishPensionHelp.org.
The table is located at http://polishpensionhelp.org/library/response-letters-from-poland .

Any help you can provide would be greatly appreciated.

Thank you!

URL: http://polishpensionhelp.org/library/response-letters-from-poland