I got it to resize slightly better however it's not centered to the layout and some of the test ads text gets cut off. I have a layout of 640X1136 and the Iframe is 640X90. I positioned it to the bottom of the screen and I set the leadbolt banner to auto stretching.
<!DOCTYPE html><!--HTML5 doctype-->
<html><head>
<head>
<title>Leadbolt Framed Ad for Android Games</title>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
</head>
<body>
<div style="position: fixed; bottom: 0px; left: 0px; width: 640px; height: 90px;">
<script type="text/javascript" src="http://ad.leadboltads.net/show_app_ad.js?section_id=myid"></script>
</div>
</body>
</html>