anchor.diff:        </div> 
         
         <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: <section class="main-services">
    <div class="container">
      
      <div class="row">
        <h2>Our Serive</h2>
      </div>
      
      <div class="row">
  
negative.code:   <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">
            <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>
  