Header background image not responsive

I use for the header for all sites without the "startseite" the background image,see picture http://jbas-it.eu/header-background-image-01.jpg.
And it works on the desktop of my computer correct, see picture http://jbas-it.eu/header-background-image-02.jpg.
But on the mobile device the picture is not responsive, only the top part of the picture is shown, see picture http://jbas-it.eu/header-background-image-03.jpg!
Is there a posibility to make the background image responsive for mobile devices?
Here the homepage: www.jbas-it.eu

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