anchor.diff:      </ul>
     </div>
   
  -  <div class = "promo">
  +  <div class = "promo three">
       <h3>Database</h3>
       <ul>
         <li>ActiveRecord</li>
  
positive.code: 
  <div class = "promo-container">
  
    <div class = "promo">
      <h3> Programming Languages </h3>
      <ul>
        <li>Ruby</li>
  
negative.code:     </ul>
    </div>
  
    <div class = "promo two">
      <h3> Web Frameworks </h3>
      <ul>
        <li>Rails</li>
  