How to set table border = 0 ?

Hi,

how can I set the table border to zero for all tables in a post or on a single page?
I tried it with <table border ="0"> but it didn´t work. Is there something in the style css?

And how can I set the font size in normal texts on pages and blog entries?

Thx


Edit: ok, the normal CSS code works now:

table, th, td
{
border: 0px;
}

Still have the question about the font size

 

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

p{
font-size:16px;
}

 

Thank you