app/views/devise/sessions/new.html.erb
<h2>Inicio de Sesión</h2>
<%= simple_form_for(resource,
as: resource_name,
url: session_path(resource_name)
) do |f| %>
<div class="form-inputs">
<%= f.input :nusuario, required: false, autofocus: true,
label: "Usuario" %>
<%= f.input :password, required: false, label: "Clave" %>
<% if devise_mapping.rememberable? %>
<%= f.label :remember_me, 'Recordarme', :class => 'control-label' %>
<%= f.check_box :remember_me %>
<% end %>
</div>
<div class="form-actions">
<%= f.button :submit, "Iniciar Sesión",
'data-turbo' => false %>
</div>
<% end %>