/* Book traversal links */
li.book-nav-prev_url {
  list-style-type: none;
  text-align: left;
}
li.book-nav-parent_url {
  list-style-type: none;
  text-align: center;
}
li.book-nav-next_url {
  list-style-type: none;
  text-align: right;
}