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If you want to modify the background color of the Web view, not the background color of the HTML page but the default gray one “under” it, just open the PhoneGapLib.xcodeproj into your Documents (or wherever you put it) and edit PhoneGapDelegate.m at aline 160 and add, after:
webView = [ [ UIWebView alloc ] initWithFrame:screenBounds ]; [webView setAutoresizingMask: (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight) ];
this line:
[webView setBackgroundColor:[UIColor blackColor]];
Now your background is black!