.nav {
  font-size: 85%;
  }
div.neighbours {
  text-align: center;
  margin: 2em 0;
  padding-top: 1em;
  }

div.neighbours div.next {
  float: left;
  clear: left;
  width: 35%;
  text-align: left;
  }

div.neighbours div.previous {
  float: right;
  clear: right;
  width: 35%;
  text-align: right;
  }
span.top {
  padding-top: 1em;
  }