bookstore/app/views/users/new.html.erb

<div class='container'>
  <h4>Sign Up</h4>
  <%= form_for @user do |f|%>
    <%= f.label :email%>
    <%= f.text_field :email%>
    <%= f.label :password%>
    <%= f.password_field :password%>
    <%= f.submit 'Sign up', class: 'btn' %>
  <%end%>
</div>