So the background image is resizing and busting out of viewport when 'site url' portion moves up and down. The problem is occurring in Chrome Android. Here is a video link of the problem.
https://youtube.com/watch?v=HsxC3Pa1JC4
And I am just using basic styling for image.
body {
background-image: url('imgurl');
background-size: cover;
background-attachment: fixed;
background-repeat: no-repeat;
background-position: left;
}
I haven't tried anything yet because I don't know whats the issue exactly.