app/views/devise/registrations/new.html.erb
<div class="form-signin">
<%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>
<%= devise_error_messages! %>
<h2 class="form-signin-heading"><%= t('sign_up') %></h2>
<%= f.email_field :email, autofocus: true, placeholder: t('users.email') %>
<%= f.password_field :password, placeholder: t('users.password') %>
<%= f.password_field :password_confirmation, placeholder: t('users.password_confirmation') %>
<div><%= f.submit t('sign_up'), class: "btn btn-primary" %></div>
<% end %>
<%= render "devise/shared/links" %>