width of the nav must be full screen to show the right dropdown menu

[Alfxjx]

when I apply this lib to my app, found that the position of the dropdown menu is not at the right place, after investigate Ifound that in example, the

element is the width of the screen, with logo on top of it. But in my app, the logo is in the same line with the nav.
so i put the logo and the nav on different z-index to solve this problem.