Table border colours

Greetings,

And thank you for this very beautiful theme.

I have been facing an annoying, yet seemingly very simple problem: the inner lines of tables remain unaffected by the tag ‘bordercolor’.

Please see an example of this issue:

I assume this may be related to the theme, since I used the same code in other websites with other themes and it worked as expected.

How could this be solved?

Thank you!

Samuel