I don`t see the white bar?
This is when you try scrolling beyond the page length
Are you talking about the big empty space at bottom of your site?
In that case, you need to adjust your footer and min-height of the page.
Even in your screenshot I cannot detect the white bar. What am I missing?
I was not able to scroll beyond the page length.
I copy what Uwe said!
Don't any white bar, can you share a screenshot which might guide us well.