Site shifts left and right ( 7.1 )

Site URL: http://joaoruas.com

http://www.joaoruas.com

pass: 777

I have this odd issue that when I click any section, the site shifts a few pixels to the right.

just hit the "ABOUT" or any other section and you will see.

I tried a bunch of things in css and nothing worked. I even deleted all the custom css and the problem persists.

Can anyone help me please?

it seems I kind of solved the issue which was the scrollbar...

I used 

html { overflow-y: scroll; } 

however, I have to say I would prefer to ignore the scrollbar width instead of leaving it there all the time... any ideas on how to do that?

try

html, body {
	overflow-x: hidden;
}