meta/lib/meta_web/templates/user_registration/new.html.eex

<h1>Register</h1>

<%= form_for @changeset, Routes.user_registration_path(@conn, :create), fn f -> %>
  <%= if @changeset.action do %>
    <div class="alert alert-danger">
      <p>Oops, something went wrong! Please check the errors below.</p>
    </div>
  <% end %>

  <%= text_input f, :username, required: true, placeholder: "Username" %>
  <%= error_tag f, :username %>

  <br />

  <%= text_input f, :email, required: true, placeholder: "E-mail" %>
  <%= error_tag f, :email %>

  <br />

  <%= password_input f, :password, required: true, placeholder: "Password" %>
  <%= error_tag f, :password %>

  <br />

  <p>
  Can you answer the following expression to confirm you are not a basic robot?

  <br />

  <b><%= @captcha %> = </b>

  <%= text_input f, :captcha, placeholder: "Captcha" %>
  <%= error_tag f, :captcha %>

  </p>

  <div>
    <%= submit "Register" %>
  </div>
<% end %>