anchor.diff:  <div class="container">
  -  <h3>Send a Message</h3>
  +  <% if @conversation.sender != current_user %>
  +    <h3><%= @conversation.sender.first_name%></h3>
  +  <% else %>
  +    <h3><%= @conversation.recipient.first_name%></h3>
  +  <% end %>
     <ul>
     <% @messages.each do |message| %>
   
  
positive.code:       <div class="col s8 offset-s4 m5">
          <div class="card-panel green lighten-3">
            <span class="white-text">
              <%= message.body %>
            </span>
          </div>
        </div>
  
negative.code:       <div class="col s8 m5">
          <div class="card-panel blue lighten-1">
            <span class="white-text">
              <%= link_to message.user.first_name, message.user.first_name %>:
              <%= message.body %>
            </span>
          </div>
  