anchor.diff:        border-radius: 4px;
         margin: 1em 0px;
         display: block;
  -      width: 978px;
  +      max-width: 978px;
       }
   
       .summary {
  
positive.code:     .source {
        border: 1px solid #D9D9D9;
        background: #ECECEC;
        width: 978px;
      }
  
      .source pre {
  
negative.code: <html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Action Controller: Exception caught</title>
    <style>
      body {
  