Hamburger menu and callout button disappear in mobile

I'm using the bizboost theme. On the desktop everything is fine, but when the navigation bar collapses in the mobile website display, the callout button (Shop Now) and the hamburger menu (3 lines) disappear. You can click on the upper right hand corner and the hamburger menu displays, although it is invisible (on mobile) but I can't figure out how to make that or the callout button display visibly.