HTML Table Question

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I tried to contact Pujols for this question, but I got a bounced back email saying the email address didn't exist or whatever. So, I'll just ask here.

I've noticed when using Pujols' tables, his tables don't change from the generator to the site. If I make my own custom table, it changes from how I see it in DreamWeaver, to how it actually displays on the site.

I thought if I had a stylesheet this would resolve the problem. I was wrong. It seems the forum CSS or style takes over the HTML I'm trying to use. One example is I never use cell padding or spacing in my tables. When I preview the tables on the site, they have cell padding and spacing due to the site custom CSS or whatever. Is there something I can do to prevent this from happening? Thanks!