app/views/sign_ups/_form.html.erb


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<%= form_for(@sign_up) do |f| %>
  <div class="field">
    <%= f.label :email, "Want to know when we're ready to launch?" %>
    <%= f.email_field :email, placeholder: 'Email' %>
    <% if @sign_up.errors.any? %>
      <div id="error_explanation">
        <ul>
        <% @sign_up.errors.full_messages.each do |msg| %>
          <li><%= msg %></li>
        <% end %>
        </ul>
      </div>
    <% end %>
  </div>
  <div class="actions">
    <%= f.submit "Sign up now" %>
  </div>
<% end %>