anchor.diff:        border-radius: 4px;
         margin: 1em 0px;
         display: block;
  -      width: 978px;
  +      max-width: 978px;
       }
   
       .summary {
  
positive.code: <html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>Action Controller: Exception caught</title>
    <style>
      body {
  
negative.code:     }
  
      .line.active {
        background-color: #FCC;
      }
  
      .button_to {
  