Editing Html

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Hey, I ran into a problem when I was creating a contact directory. I am using the CSV block and am using it to generate a table that is updateable by csv doc. The problem is that unlike the content block and others I can't edit the block html. So I tried to find a way to edit the html of the entire page I can't control the cellspacing with css through the style sheets and the only way it is responding is by altering the html(through firebug) Can anyone tell me how I can edit the html of the entire page? Thanks in advance.

pakigreenl