#pdf_preview{
  position:absolute;
  top: 0px;
  right:64px;
  box-shadow: 10px 10px 5px #888888;
}

img.pdf_preview{
  border:1px solid #aaa;
  height:480px;
}

img.pdf_preview1{
  border:1px solid #aaa;
  height:900px;
}