anchor.diff:      <div class="card">
         <div class="card-content">
           <div class="card-title">Word complexity</div>
  -        <div id="graph-word-complexity"></div>
  +        <p>
  +          Number of unique...
  +        </p>
  +        <%=
  +          pie_chart({
  +            'simple words'  => analysis.simple_words_count,
  +            'complex words' => analysis.complex_words_count
  +          })
  +        %>
         </div>
         <div class="card-action">
           <a class="activator blue-text text-darken-4">
  
positive.code:     <div class="card">
        <div class="card-content">
          <div class="card-title">Word variety</div>
          <div id="graph-word-variety"></div>
        </div>
        <div class="card-action">
          <a class="activator blue-text text-darken-4">
  
negative.code:         </a>
        </div>
        <div class="card-reveal">
          <span class="card-title grey-text text-darken-4">
            Why is this important?
            <i class="material-icons right">close</i>
          </span>
        </div>
      </div>
    </div>
  