anchor.diff:                        <a href="https://es-es.facebook.com/EducaInternet/" class="fa fa-facebook" style="color: #3b579d; margin-right: 40px;"></a>
                         <a href="https://twitter.com/EducaInternet" class="fa fa-twitter" style="margin-right: 40px; color: #1da1f3;"></a>
                         <a href="https://www.youtube.com/channel/UCH_RLT0J0CPBbOnibBO_mzg" class="fa fa-youtube-play" style="color: #d40c1d; margin-right: 40px;"></a>
  -                      <a href="https://blog.educainternet.es/"><img width="" style="width: 100px; padding-top: 10px;" src="<%=Vish::Application.config.full_domain%>assets/orange/logo-blog_educa.png"></a>
  +                      <a href="https://blog.educainternet.es/"><img style="width: 100px; padding-top: 10px;" src="<%=Vish::Application.config.full_domain%>/assets/orange/logo-blog_educa.png"></a>
                       </div>
                       <p style="text-align: center; margin-bottom: 20px; padding-bottom: 30px;"><%= t('contest.first_mail.body6') %></p>
                     </div>
  
positive.code:                     <p style="text-align: center;margin-bottom: 20px;">
                        <%= t('contest_page.help_center.text') %>
                      </p>
                      <iframe width="720" height="405" src="https://www.youtube.com/embed/?listType=playlist&list=PL-qNzC6Q_XM5tMM04Abi8Oy-qHVovu_-0" frameborder="0" allowfullscreen></iframe>
  
                    </div>
                  </td>
                </tr>
  
negative.code: <!DOCTYPE html>
  <html>
  <head>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.css">
  </head>
  <body>
    <table style="background-color: #eeeeee; height: 300px; padding-bottom: 40px; border:0; font-family: Helvetica,Arial,sans-serif;" cellpadding="0" cellspacing="0" width="100%">
      <tbody>
  