anchor.diff:        top: 150px;
       }
   
  +    .border-qr {
  +      width: 174px;
  +      height: 174px;
  +      border: 5px solid #07b571;
  +    }
  +
       .center.qr img {
         left: 50%;
         top: 50%;
  
positive.code: 
      .row-w {
        width: 100%;
      }
  
      .col1 {
  
negative.code:       aufschreiben
      </div>
      <div class="col2">
        <div class="border-qr">
        <img id="qr" src="<%= @qrcode.to_data_url %>">
        </div>
      </div>
    </div>
  
  