anchor.diff:    <div class="container">
       <div class="row text-center">
         <div class="col-md-4">
  +        
  +          <img src="http://placehold.it/600x400" class="img-responsive" width="100%">
           <div class="well">
  -          <img src="http://placehold.it/600x400" class="img-responsive" width="100%">
             <h2>Section Header</h2>
             <p>In publishing and graphic design, lorem ipsum is a filler text commonly used to demonstrate the graphic elements of a document or visual presentation.</p>
             <a href="#" class="btn btn-primary">This is a button</a>
  
positive.code:           <p class="service-header">Sheffield Vision Centre</p>
          </div>
        </div>
      </div>
    </div>
  </section>
negative.code:       </div>
        
        <div class="col-md-4">
          
          <img src="http://placehold.it/600x400" class="img-responsive" width="100%">
          <div class="well">
          <h2>Section Header</h2>
          <p>In publishing and graphic design, lorem ipsum is a filler text commonly used to demonstrate the graphic elements of a document or visual presentation.</p>
          <a href="#" class="btn btn-primary">This is a button</a>
  