app/views/devise/passwords/edit.html.erb
<div class="container">
<div class="row">
<div class="col-sm-6 col-sm-offset-3 col-xs-8 col-xs-offset-2 form-frame">
<h2>Change your password</h2>
<%= form_for(resource, :as => resource_name, :url => password_path(resource_name), :html => {:method => :put}) do |f| %>
<div class="form-group">
<%= devise_error_messages! %>
<%= f.hidden_field :reset_password_token %>
</div>
<div class="form-group">
<%= f.label :password, "New password" %>
<%= f.password_field :password, :class => 'form-control', :autofocus => true %>
</div>
<div class="form-group">
<%= f.label :password_confirmation, "Confirm new password" %>
<%= f.password_field :password_confirmation, :class => 'form-control' %>
</div>
<div class="form-group">
<%= f.submit "Change my password", :class => "btn btn-primary btn-block" %>
</div>
<% end %>
<%= render "devise/shared/links" %>
</div>
</div>
</div>