smooth scrolling

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type"content=
"text/html; charset="UTF-8">
<title>Untitled Document</title>
<style type="text/css">
body {
    margin:0;
    font:30px Arial, Helvetica, sans-serif;
}
section {
    background-color: #09C;
    display: block;
    height: 2000px;
    padding:60px;
    padding-left:120px;
}
#one{
    background:#0C2C59;
    color:#FFF;
}
#two{
    background:#04528A;
    color:#FFF;
}
#three{
    background:#279C5C;
    color:#FFF;
}
#four{
    background:#257D2A;
    color:#FFF;
}
#five{
    background:#34631F;
    color:#FFF;
}

nav {
    position:fixed;
}
body nav a {
    font-size: 12px;
    color: #FFF;
    background-color: #000;
    text-align: center;
    display: block;
    margin: 3px;
    padding: 10px;
}
</style>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>

<script type="text/javascript">
$(document).ready(function() {
  function filterPath(string) {
  return string
    .replace(/^\//,'')
    .replace(/(index|default).[a-zA-Z]{3,4}$/,'')
    .replace(/\/$/,'');
  }
  var locationPath = filterPath(location.pathname);
  var scrollElem = scrollableElement('html', 'body');

  $('a[href*=#]').each(function() {
    var thisPath = filterPath(this.pathname) || locationPath;
    if (  locationPath == thisPath
    && (location.hostname == this.hostname || !this.hostname)
    && this.hash.replace(/#/,'') ) {
      var $target = $(this.hash), target = this.hash;
      if (target) {
        var targetOffset = $target.offset().top;
        $(this).click(function(event) {
          event.preventDefault();
          $(scrollElem).animate({scrollTop: targetOffset}, 400, function() {
            location.hash = target;
          });
        });
      }
    }
  });

  // use the first element that is "scrollable"
  function scrollableElement(els) {
    for (var i = 0, argLength = arguments.length; i <argLength; i++) {
      var el = arguments[i],
          $scrollElement = $(el);
      if ($scrollElement.scrollTop()> 0) {
        return el;
      } else {
        $scrollElement.scrollTop(1);
        var isScrollable = $scrollElement.scrollTop()> 0;
        $scrollElement.scrollTop(0);
        if (isScrollable) {
          return el;
        }
      }
    }
    return [];
  }

});
</script>

</head>

<body>
<nav><a href="#one">one</a> <a href="#two">two</a> <a href="#three">three</a> <a href="#four">four</a> <a href="#five">five</a></nav>
<section id="one">Page One<p> how do i make this text smaller?</section>
<section id="two">Page Two</section>
<section id="three">Page Three</section>
<section id="four">Page Four</section>
<section id="five">Page Five</section>
</body>
</html>