How to get table border styles etc on article page

Hello to you

In using Gavick YourShop, which works well for me, I find that I need to display a couple of pages with tables of admission prices and I'd like these to have coloured borders etc. What CSS etc and where do I need to access this?
Many thanks
Steve

I have the same problem, I set the table using an html editor, but when I copy the code, the bordes don't appear.