header not responsive

hello.
i’m working at the final of l2gshop.com and now i have problem that i don’t have noted befeore.
image in header is no responsive and i can’t disable in mobile navigation.
you can see here
http://www.l2gshop.com/portfolio/modulnova/
the image inlcude the title because the customer prefer so.
when i view this page in smartphone the title “modulnova” go to the center of the page.
i need that this section si responsive or i need to disable on mobile and use a normal title without background.
how i can do?
regards
Francesco