app/views/layouts/application.html.erb
<!DOCTYPE html>
<html>
<head>
<title>SISO</title>
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %>
<%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
<%= csrf_meta_tags %>
</head>
<body>
<div id="header">
<h1>SISO</h1>
<%= image_tag('logo.png', size: '280x60', alt: ' ') if File.exists?("#{Rails.root}/app/assets/images/logo.png") %>
<div id="clear"></div>
</div>
<div id="content">
<h2 id="header"><%= yield :header%></h2>
<div id="material">
<%= yield %>
</div>
<%= yield :info%>
</div>
<%-#<div id="footer"></div>#>-%>
</body>
</html>