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It reads as they you want the 'main table' margin-bottom: flush with the bottom of the page. Presuming that the table has enough content to reach the bottom of the web page (possibly better described as the bottom of view port which will vary considerably depending upon the user) I would look at setting:
html, body {
margin: 0; padding: 0;
}
If that doesn't do it then I would look at the margin and padding of the table.