anchor.diff:  <!DOCTYPE html>
   <html lang="en">
   <head>
  -  <!-- 
  +  <!--
       normalize.css removes cross-browser differences in defaults, e.g.,
       differences in how form elements appear between Firefox and IE
       See: http://necolas.github.com/normalize.css/
     -->
  -  
  +
     <meta charset="utf-8">
     <title>Home-to-Horizon</title>
     <link rel="shortcut icon" type="image/png" href="../../assets/hh_favicon.png">
  
positive.code:         <li><a href="projects">Explore</a></li>
          <li><a href="/contribute">Contribute</a></li>
        </ul>
        
        <% if session[:user_id] %>
        <ul class="nav navbar-nav navbar-right">
          <li class="dropdown">
  
negative.code:   <!-- Stylesheets -->
    <link rel="stylesheet" href="/css/normalize.css">
    <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <link rel="stylesheet" href="/css/application.css">
    <meta name="viewport" content="width=device-width, initial-scale=1">
  
    <!-- Scripts -->
  