Overcoming CSS rule

using firebug can see efforts show table borders futile, have rule in styles.css:

 

table, td, div, img { border:0; border-collapse:collapse;}

 

how create class style provide exception rule?

i found if manually add style attribute works out ok. this:

 

 

when create table in dw looks this:

 

 

and gets overridden css.

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