app/views/devise/passwords/edit.html.erb
<div class="container">
<div class="row">
<div class="col-md-4 col-md-offset-4">
<div class="panel panel-default">
<div class="panel-heading">
<h2>Cambiar contraseña</h2>
</div>
<div class="panel-body">
<%= simple_form_for(resource, as: resource_name, url: password_path(resource_name), html: { method: :put }) do |f| %>
<%= f.error_notification %>
<%= f.input :reset_password_token, as: :hidden %>
<%= f.full_error :reset_password_token %>
<div class="form-inputs">
<%= f.input :password, label: "Nueva contraseña", required: true, autofocus: true, hint: ("mínimo #{@minimum_password_length} caracteres" if @minimum_password_length) %>
<%= f.input :password_confirmation, label: "Confirmar contraseña", required: true %>
</div>
<div class="form-actions">
<%= f.button :submit, "Cambiar contraseña" %>
</div>
<% end %>
<%= render "devise/shared/links" %>
</div>
</div>
</div>
</div>
</div>