How Do I Remove the Rectangle at the Bottom?

[squonix]

Hello there.

I created a theme some weeks ago, and the problem is that there is a white rectangle at the bottom of the screen. After some searching, I found out that a file called mta_filler was responsible for this. As you expected, I removed the file, but the rectangle was still there. Is there a way to remove this rectangle?

Thanks.

Edited October 9, 2016 by squonix