app/views/layouts/application.html.erb
<!DOCTYPE html>
<html>
<head>
<title>CashEnvelope</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<%= stylesheet_link_tag "application", :media => "all" %>
<%= javascript_include_tag "application" %>
<%= csrf_meta_tags %>
</head>
<body class="container">
<% if flash[:notice] %>
<p class="notice"><%= flash[:notice] %></p>
<% end %>
<% if flash[:alert] %>
<p class="alert"><%= alert %></p>
<% end %>
<% if flash[:error] %>
<p class="error"><%= flash[:error] %></p>
<%end%>
<%= yield %>
</body>
</html>