body {
  padding: 0;
  margin: 0;
  background-color: transparent;
}

#a8r_iframe {
  position: fixed;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
}
#a8r_iframe > iframe {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  width: 100%;
  height: 100%;
  border: none;
  margin: 0 auto;
}