app/views/layouts/_messages.html.erb
<%# Rails flash messages styled for Bootstrap 3.0 %>
<% if flash.present? %>
<div class="application-notifications row">
<% flash.each do |name, messages| %>
<% if messages.present? %>
<div class="alert alert-<%= name.to_s == 'notice' ? 'success' : 'danger' %> col-sx-12">
<button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
<% Array.wrap(messages).each do |message| %>
<%= content_tag :div, message, :id => "flash_#{name}" %>
<% end %>
</div>
<% end %>
<% end %>
</div>
<% end %>