anchor.diff:  <table style="background-color: #f3f3f3; width: 100%;">
     <tr>
       <td>
  -      <h1 style="color:#0a0a0a;font-size:28px;line-height:1.3;text-align:center;">
  +      <h1 style="color:#0a0a0a;font-size:28px;line-height:1.3;text-align:center;font-family:Helvetica,Arial,sans-serif;">
           <%=t 'user_notifications.digest.popular_posts' %>
         </h1>
       </td>
  
positive.code: <% end %>
  
  </tbody>
  </table>
  
  <%= digest_custom_html("below_popular_topics") %>
  
negative.code:       </td>
        <td style="color:#0a0a0a;padding:0 16px 0 8px;text-align:left;">
          <h6 style="color:inherit;font-size:18px;font-weight:400;line-height:1.3;margin:0;padding:0;word-wrap:normal;"><%= t.user.try(:username) -%></h6>
          <% if SiteSetting.enable_names? && t.user.try(:name).present? %>
            <p style="color:#8f8f8f;line-height:1.3;margin:0 0 16px 0;padding:0;"><%= t.user.name -%></p>
          <% end %>
        </td>
  