<%= render 'articles/header',
           header_class: '',
           header_image: 'http://demos.creative-tim.com/material-kit-pro/assets/img/bg10.jpg',
           header_title: 'Instruction' %>

<%= render 'articles/layout', content_class: 'col-md-8 col-lg-offset-2' do %>
  <%= @content %>
<% end %>

<%= render 'articles/header',
           header_class: '',
           header_image: asset_path('library.jpg'),
           header_title: 'Instruction' %>

<%= render 'articles/layout', content_class: 'col-md-8 col-lg-offset-2' do %>
  <%= @content %>
<% end %>

Update image header for instruction page
Update image header for instruction page
