The only things I've done different than the tutorial are that I have a picture/logo instead of "linked text", I've got a bottom border on my nav-bar container, and I've adjusted the margin on the picture/logo so that it hangs down out of the container, and I put a background color on my sub-nav container. Other than that I've followed the tutorial exactly as far as I can tell.
But when I preview it I don't see the nav-bar with my logo and hamburger icon at all. Earlier I did see it, but when I'd go to a wider screen the menu would go horizontal but it wouldn't replace the hamburger - it would stay below the nav-bar container. And in trying to figure that out, somehow now I can't even see the nav-bar when I preview it. It's weird that it mostly worked at first and now not at all.
In the tutorial, on wider screens the "My Site" stays there and the menu goes horizontal and comes up into that div replacing the hamburger. That's what I'm trying to achieve. I'm missing something and can't figure out what.