anchor.diff:        aufschreiben
       </div>
       <div class="col2">
  +      <div class="border-qr">
         <img id="qr" src="<%= @qrcode.to_data_url %>">
  +      </div>
       </div>
     </div>
   
  
positive.code:       top: 150px;
      }
  
      .center.qr img {
        left: 50%;
        top: 50%;
  
negative.code: 
      .row-w {
        width: 100%;
        margin-left: 37px;
      }
  
      .col1 {
  