I've been watching this youtube video about a custom navigation:
https://www.youtube.com/watch?v=hzxyOb9AVfQ
Everything seems smooth and fine in the youtube video. When I try to impement this in my FF project, when I navigate between pages, I see a 'slight' 'bump' when I navigate from page to page. I can't put it exactly to words, but it is like the nav bar is not fixed, but seems to 'bump' on the page along with the rest of the page. How can I make it so that the page load is smooth and there is no such 'bump' when the page loads?