Append Grapper to the bottom half of the window

gistfile1.js

var grapper = document.createElement('iframe');
grapper.id = 'grapper';
grapper.src = 'http://dev16.706.yelpcorp.com:4773/';
document.body.appendChild(grapper);

gistfile2.css

#grapper {
  position: fixed;
  z-index: 9999;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 70%;
  border: 0;
}