anchor.diff:                      <tr>
                           <td style="padding: 20px 0 0;">
                               <center>
  -                                <a href="<%= Rails.application.config.action_mailer.default_url_options.host || "" %>?ref=<%= @user.referral_code %>" style="font-family: 'Times', serif; font-size: 14px; letter-spacing: 0.05em; color: #6c6c6c; text-decoration: none" target="_blank"><%= Rails.application.config.action_mailer.default_url_options.host || "" %>?ref=<%= @user.referral_code %></a>
  +                                <a href="<%= Rails.application.config.action_mailer.default_url_options || "" %>?ref=<%= @user.referral_code %>" style="font-family: 'Times', serif; font-size: 14px; letter-spacing: 0.05em; color: #6c6c6c; text-decoration: none" target="_blank"><%= Rails.application.config.action_mailer.default_url_options || "" %>?ref=<%= @user.referral_code %></a>
                               </center>
                           </td>
                       </tr>
  
positive.code:                     <tr>
                          <td style="padding: 27px 0 27px;">
                              <center>
                                  <img src="<%= Rails.application.config.action_mailer.default_url_options.host %>/assets/logo.jpg" alt="Harry's" style="display: block; margin: 0 auto; padding: 0; border: 0;">
                              </center>
                          </td>
                      </tr>
  
negative.code:                     <tr>
                          <td style="padding: 22px 0 0;">
                              <center>
                                  <img src="<%= Rails.application.config.action_mailer.default_url_options %>/assets/harrys-is-coming.jpg" alt="Harry's Is Live! We're launcing a new shave brand. You'll be the first to know." style="display: block; margin: 0 auto; padding: 0; border: 0;">
                              </center>
                          </td>
                      </tr>
  