app/views/layouts/_flash_messages.html.erb
<div id='flash-messages'>
<% flash.each do |key, value| %>
<% if ['notice','info'].include?(key) && value.present? %>
<div class="flash-bar">
<div class="row">
<p><%= value.html_safe %></p>
<a href="#"><i class="fa fa-times" aria-hidden="true"></i></a>
</div>
</div>
<% end %>
<% if ['error','alert'].include?(key) && value.present? %>
<div class="flash-bar-error">
<div class="row">
<p><%= value.html_safe
%></p>
<a href="#"><i class="fa fa-times" aria-hidden="true"></i></a>
</div>
</div>
<% end %>
<% end %>
</div>
<%# flash.clear %>