anchor.diff:              <!-- CABECERA MAIL-->
               <thead style="background-color: #FFF; height: 70px; display: block;position:relative;">
                <tr>
  -              <td style="padding-left:25px;padding-top:20px;">
  +              <td style="padding-top:20px;">
   
                 </td>
  -            </thead>
  -            <!-- LINEA GRIS-->
  -            <thead style="background-color: #999999;min-height: 0px;display: block;">
  +             </tr>
               </thead>
   
               <tbody>
  
positive.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/" 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 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>
  
negative.code: <html>
  <head>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
  </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%">
  