Responsive Header Menue has the wrong colour on my smart phone


i saw that the rsponsive header region (menu) of my sydney pro theme has a new colour (blue). This is just happen with my smart phone.
How can i change this?
The colour should be black.

The normal view (with my desktop computer is right)

Kind regards


Hello Sergio,

Can you please provide a link to your website?

Kind Regards, Roman.