fullPage.js with scroll inside sections & fixed element

fullPage.js with scroll inside sections & a fixed element also following the scroll.

HTML

<link rel="stylesheet" href="http://alvarotrigo.com/fullPage/jquery.fullPage.css">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script src="http://alvarotrigo.com/fullPage/vendors/jquery.easings.min.js"></script>
<script src="http://alvarotrigo.com/fullPage/jquery.fullPage.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jQuery-slimScroll/1.3.7/jquery.slimscroll.min.js"></script>
<body>
  <div id="fullpage">
    <div id="fixed-elem" class="fixed-elem">
      My fixed element
      <br> My fixed element
      <br> My fixed element
      <br> My fixed element
      <br> My fixed element
      <br>
    </div>
    <div class="section">
      <div class="intro">
        <h1>Scrolling inside sections</h1>
        <p>Easy and useful! Just make use of the option `scrollOverflow` for it and add the slimScroll plugin!
          <br>
        </p>

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          Eu enim laudem reformidans vel. Pro clita quando ad. Usu...

CSS

h1 {
  font-size: 3em;
}

h2 {
  font-size: 2.4em;
}

h1,
h2,
p {
  color: white;
  padding: 30px;
}

.fixed-elem {
  position: fixed;
  z-index: 500;
  top: 100px;
  right: 20px;
  padding: 20px;
  background-color: rgba(250, 250, 250, 0.5);
}

JavaScript

$(document).ready(function() {
  $('#fullpage').fullpage({
    sectionsColor: ['#4A6FB1', '#939FAA', '#323539', '#49AAFF'],
    scrollOverflow: true,
    afterLoad: function(anchorLink, index) {
      moveFixedElemToSlide(index);
    }
  });

  function moveFixedElemToSlide(oneBasedIndex) {
		var zeroBasedIndex = oneBasedIndex - 1;
    var topDistance = $('.section:eq('+zeroBasedIndex+')').position().top + 100;
    $('#fixed-elem').css({'top': topDistance});
  }
});