app/views/trestle/flash/_alert.html.erb
<div class="alert alert-dismissable <%= html_class %>" role="alert">
<button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
<%= icon %>
<div class="alert-content">
<% if alert[:title] %>
<h3><%= alert[:title] %></h3>
<% end %>
<% if alert[:message] %>
<p><%= alert[:message] %></p>
<% end %>
<%= yield if block_given? %>
</div>
</div>