anchor.diff:  <div class="section" id="venue">
     <div class="centered">
       <h3>Venue
  -      <a href="#"class="back_top">to the top ^</a>
  +      <a href="#" class="back_top">to the top ^</a>
       </h3>
   
       <h4>
  
positive.code: 
  <div class="section" id="speakers">
    <h3 class="centered">Speakers
      <a href="#"class="back_top">to the top ^</a>
    </h3>
    <ul class="centered">
      <li>
  
negative.code: 
  <div class="section" id="sponsors">
    <h3 class="centered">Sponsors
      <a href="#" class="back_top">to the top ^</a>
    </h3>
    <p class="centered">
      Information about sponsorship packages will be available soon
  