app/views/devise/sessions/show.html.erb
<div class="col-sm-6 col-md-4" style="position:absolute; margin:auto; right: 0; left:0;">
<div class="thumbnail">
<img />
<div class="caption">
<h3><%= @user.name %></h3>
Role: <%= @user.role %> <br>
Email: <%= @user.email %> <br>
Address: <%= @user.address %> <br>
Phone #: <%= @user.phone_number %><br>
<%= link_to "Back", :back, :class => 'btn btn-primary' %>
</div>
</div>
</div>