Default Navigation Bar

Well, the reason of this topic is that some aspects of the navigation bar don't work or don't work correctly. First, when i'm on home, either on the default launcher or in the Google Experience Launcher, the navigation bar is completely black, not even transparent.

I thought that the navigation bar, as the status bar, would be translucent. But it isn't even transparent.

Is there any solution for it? Without rooting? I still don't want to lose warranty as I just have got this Moto X since mid-January. I'll root in two or three months.

Anyway, solutions?

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