rails_website_template/app/views/devise/confirmations/new.html.erb

<h2>Resend confirmation instructions</h2>

<%= simple_form_for(resource, as: resource_name, url: confirmation_path(resource_name), html: { method: :post }) do |f| %>
  <%= f.error_notification %>
  <%= f.full_error :confirmation_token %>

  <div class="form-inputs">
    <%= f.input :email, required: true, autofocus: true %>
  </div>

  <div class="form-actions">
    <%= f.button :submit, "Resend confirmation instructions" %>
  </div>
<% end %>

<%= render "devise/shared/links" %>