UIWebView background is set to Clear Color, but it is not transparent
webView.opaque = NO;
webView.backgroundColor = [UIColor clearColor];
Besides setting your webview's background to clear color, also make sure that you set opaque to false.
Also set :
[webView setBackgroundColor:[UIColor clearColor]];
[webView setOpaque:NO];
/*for ios please set this*/
[webViewFirst setOpaque:NO];
/*for html please set this*/
<body style="background:none">