sass bug in header.scss

When trying to use the overlay menu (menu-10.html) while using SASS versions of the template, the overlay background does not cover the entire page.

It only covers the height of the header.

See "header.scss" on line #1062

#header-wrap {
	position: relative;
	z-index: 199;
	@include translate3d(0,0,0);
	-webkit-perspective: 1000px;
	-webkit-backface-visibility: hidden;
}

When commenting out the following 2 lines, my problem is solved and the overlay covers the screen entirely.

@include translate3d(0,0,0);
-webkit-perspective: 1000px;

Is it safe to remove these 2 lines?

I've already updated the template when I discovered the issue.

See "css/imports/header.css" around line #1115

#header-wrap {
	position: relative;
	z-index: 199;
	-webkit-backface-visibility: hidden;
}

BUT... in "sass/header.scss" around line #1062

#header-wrap {
	position: relative;
	z-index: 199;
	@include translate3d(0,0,0);
	-webkit-perspective: 1000px;
	-webkit-backface-visibility: hidden;
}

The SASS version is different from the plain CSS version. Upon removing the 2 lines I already mentioned above (making the 2 versions the same), the problem was resolved.

I thought to bring it to your attention.