anchor.diff:  <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%">
  
positive.code:             <!-- CABECERA MAIL-->
              <thead style="background-color: #FFF; height: 70px; display: block;position:relative;">
               <tr>
                <td style="padding-left:25px;padding-top:20px;">
  
                </td>
              </thead>
              <!-- LINEA GRIS-->
              <thead style="background-color: #999999;min-height: 0px;display: block;">
              </thead>
  
              <tbody>
  
negative.code:                   <div class="redes" style="background-color: whitesmoke;">
                      <h4 style="padding-top: 30px;text-align: center; margin-bottom: 10px; margin-top: 20px; font-weight: bold;"><%= t('contest.first_mail.body5') %></h4>
                      <div class="redes_icons" style="display:flex; justify-content: center; align-items: center; font-size: 40px;">
                        <a href="https://es-es.facebook.com/EducaInternet/"><img style="width: 45px; margin-right: 40px; padding-top: 10px;" src="<%=Vish::Application.config.full_domain%>/assets/orange/facebook.png"></a>
                        <a href="https://twitter.com/EducaInternet"><img style="width: 45px; margin-right: 40px; padding-top: 10px;" src="<%=Vish::Application.config.full_domain%>/assets/orange/twitter.png"></a>
                        <a href="https://www.youtube.com/channel/UCH_RLT0J0CPBbOnibBO_mzg"><img style="width: 50px; margin-right: 40px; padding-top: 10px;" src="<%=Vish::Application.config.full_domain%>/assets/orange/youtube.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>
  