Remove Menu button from mobile

site: www.woofdriver.com I am using a Superfly plugin as an alternative menu. To remove the normal menu, I set the header menu to a menu named "blank", and then did not add any items to that menu. This worked for desktop. But for mobile, the menu button is still there. When clicked it brings up the search button. How can I remove the menu button? I don't care if I loose the search button. I tried other forum results to remove the search option from header. This removed the search field, but did not remove the text around it or the menu button.