Bar showing in posTop-a, but display is set to off

I have a module (menu) in position Top-a that is set to display only in phone mode. But in desktop and tablet mode a grey bar is showing. If I unpublish the module, the bar disappear.
See example here: fore.kogegolf.dk/index.php/gaest

Have can I get rid of the grey bar?

Regards, René

Hi there,
depends on the space which you can select in the template backend parameter.

But you can fix it. Add this code to your css/custom.css

@media screen and (min-width: 352px) {
#top-a {
display:none;
}
}

Thanks it worked with this:
@media screen and (min-width: 768px) {
#top-a {
display:none;
}
}

Now it only shows in phone mode.