the page by means of the file a12.alphagodaddy.com_index.html. This
latter is the culprit as it starts with "<body style='MARGIN:0px;' >"
(after the opening html tag). I don't know how it gets loaded but it
probably is the price you pay for this free service.
If so, try redefining the style for the „body" element. If
necessary add „!important" so that your rule overrides others.
<style type="text/css">
body {margin: 5% !important;}
</style>
(Or margin-left: 5% !important; margin-right: 5% !important; )