This would be much easier if you posted a link, so we could see what is going on.

If you set the height of a class of div and then put each table in its own div that might help you, but without a site to play with and edit, it's tricky to see what your problem is.

PS you have some totally unnecessary code there, where you tell a div to use display:block; because a div is a block level element by definition.

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