Sayed Taqui on "[Theme: Supernova] Mobile Version - Black Search Bar"

I dont know if you noticed before, the search menu was there after version 0.1 . Which version were you using before or what was the last time you updated the theme? Anyways the version you are currently using has the option to turn off responsiveness from Advanced tab after which the black search box will no longer appear.
The current version has a couple of issues so please download the latest version from http://supernovathemes.com/