anchor.diff:            <div class="col-md-6">
               Yes (<%= number_to_currency (@registration.payment_amount.to_f / 100) %>
               <% if @registration.payment_date %>
  -              on <%= @registration.payment_date&.strftime(Session::DATETIME_FORMAT) %><% end %>)
  +              on <%= @registration.payment_date&.strftime(Session::DATETIME_FORMAT) %>
  +            <% end %>)
             </div>
           <% else %>
             <div class="col-md-2">
  
positive.code:           <div class="card-header striped-outer" id="session-header-<%= session.id %>">
              <div class="row mb-0">
                <div class="col-md-5">
                  <button class="btn btn-link" type="button" data-toggle="collapse" data-target="#session-<%= session.id %>" aria-expanded="false" aria-controls="session-<%= session.id %>">
                    <%= session.name %>: <%= session.timeslot %>
                  </button>
                  <em>(Click to see
                    <% if session.premium_tables? %>non-charity
                    <% end %>games offered)</em>
                </div>
                <div class="col-md-1 no-pad"></div>
                <div class="col-md-2 no-pad ">
  
negative.code:             <hr/>
            <% end %>
  
            <button class="btn btn-link" type="button" data-toggle="collapse" data-target="#session-<%= session.id %>" aria-expanded="false" aria-controls="session-<%= session.id %>">
              Click to show regular tables for <%= session.name %>
            </button>
            <div id="session-<%= session.id %>" class="collapse" aria-labelledby="session-header-<%= session.id %>" data-parent="#session-signup">
              <div class="card-body">
                <div class="row no-pad">
                  <div class="col-md-5 header no-pad">Regular Tables for <%= session.name %>:</div>
                  <div class="col-md-1 header no-pad">Details</div>
                  <div class="col-md-2 header no-pad">Seats Remaining</div>
                  <div class="col-md-2 header no-pad" style="padding-left: 1em;">RSVP</div>
  