title: How to remove grey shadow on the top UIWebView when overscroll?
body: <p>I'm using UIWebView for show a simple HTML page. When I scroll the page (over the top or over the bottom) a shadow gray appears behind!!
  Can I remove or avoid this bad effect?</p>
  
  <p>Thx</p>
  
  <p>P.S.
  UIWebView, View container, are all background clear and opaque NO!!</p>