How to make div height auto increase as per the lenght of page?

First of all Thanks to all for giving your valuable time on this question.

I am calling id of div tag into jquery fadein to cover the page on wordpress site.

Please find the code below

Here I have set the height of div to cover the page in 100%. But it cover only full window screen. When I scroll the page down the below part of the page is seen easly It is not able to cover the bottom parts of page.

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