remove ad background ?

how can i remove the background image, so only the banner is showing ? 

local ads = require "ads" -- Create a text object to display ad status local screenGroup = self.view local statusText = display.newText( "", 0, 0, native.systemFontBold, 22 ) statusText:setTextColor( 255 ) statusText:setReferencePoint( display.CenterReferencePoint ) statusText.x, statusText.y = display.contentWidth \* 0.5, 170 local showAd -- Set up ad listener. local function adListener( event )     -- event table includes:     --         event.provider     --        event.isError (e.g. true/false )     local msg = event.response     -- just a quick debug message to check what response we got from the library     print("Message received from the ads library: ", msg)     if event.isError then         statusText:setTextColor( 255, 0, 0 )         statusText.text = "Error Loading Ad"         statusText.x = display.contentWidth \* 0.5         local screenGroup = self.view         showAd( "banner" )     else     end end -- Initialize the 'ads' library with the provider you wish to use. if appID then     ads.init( provider, appID, adListener ) end -------------------------------------------------------------------------------- -- UI -------------------------------------------------------------------------------- -- initial variables local sysModel = system.getInfo("model") local sysEnv = system.getInfo("environment") local screenGroup = self.view -- Shows a specific type of ad showAd = function( adType )     local screenGroup = self.view     local adX, adY = 400     statusText.text = ""     ads.show( adType, { x=adX, y=adY } ) end ads.show( "banner", { x=display.screenOriginX, y=display.contentHeight - 30 } )