app/views/users/forgot_password.html.erb
<div id="login-container">
<div class="logo"></div>
<div class="logo-text"></div>
<div class="box-login">
<h3>Password recovery</h3>
<%= form_tag action: 'send_password_reset' do %>
<div>
<div class="field">
<%= text_field_tag :email, "", "placeholder" => "Email", "class" => "big-input" %>
</div>
<%= submit_tag('Send e-mail', "class" => "big-input button button-request") %>
</div>
<% end %>
</div>
</div>