app/views/estimations/_estimation.html.erb
<%= link_to estimation, class: 'list-group-item', id: dom_id(estimation) do %>
<%= estimation.title %>
<div class="removal-button pull-right">
<%= button_to estimation, method: :delete, remote: true, class: 'close' do %>
<span>×</span>
<% end %>
</div>
<span class="text-muted pull-right">
<span class="text-success"><strong><%= estimation.sum %></strong></span>
+
<span class="text-info"><strong><%= estimation.buffer %></strong></span>
=
<span class="text-warning"><strong><%= estimation.total %></strong></span>
</span>
<% end %>