#content h1 {
  text-align: center;
}

#notebookexample_pages {
  width: 700px;
  margin: 0 auto;
}
#notebookexample_pages div {
  float: left;
  width: 350px;
  height: 495px;
}

#notebookexample_pager {
  width: 700px;
  margin: 1em auto;
}

#notebookexample_prev, #notebookexample_next {
  display: block;
  width: 50%;
  height: 1em;
  float: left;
}

#notebookexample_prev {
  text-align: right;
}

#notebookexample_next {
  text-align: left;
}