app/views/devise/passwords/edit.html.erb
<div class="col-md-offset-2 col-md-8">
<div class="panel panel-default">
<div class="panel-heading"><%= t('.title') %></div>
<div class="panel-body">
<%= simple_form_for(resource, :as => resource_name, :url => password_path(resource_name), :html => { :method => :put, class: "form-horizontal" }) do |f| %>
<%= f.input :reset_password_token, :as => :hidden %>
<%= f.input :password, :as => :password %>
<%= f.input :password_confirmation, :as => :password %>
<div class="form-actions">
<%= link_to t("cancel"), unauthenticated_root_path, :class => "btn btn-default" %>
<%= f.button :submit, :value => t("devise.passwords.edit.commit"), :class => "btn-info" %>
</div>
<% end %>
</div>
</div>
</div>