Page zooms in for a second upon opening

Hi,

I'm fairly new to GeneratePress so perhaps this is a real beginner question. I'm really happy with the GeneratePress template :) But I still have a small issue that I'd like resolved if possible.

When I open the pages on my site http://www.indiv.co the pages "zoom in" for a second because the scroll bar of the browser is still not shown. After a second the page is fully loaded and the scroll bar is shown.

In my opinion this is pretty annoying since this happens every time someone clicks a link. How can I make the page load more smoothly without the 'zooming in' effect?

Thank you!