asciinema.org/app/views/users/new.html.erb

<section class="supplimental">
  <div class="wrapper">
    <%= form_for @user, :url => '/user', :html => { :class => 'form-horizontal' } do |f| %>
      <fieldset>
        <legend>Your new account</legend>

        <div class="control-group <%= 'error' if @user.errors[:nickname].present? %>">
          <%= f.label :nickname, 'Username', :class => 'control-label' %>
          <div class="controls">
            <%= f.text_field :nickname, :class => 'text_field' %>
            <span class="help-inline"><%= @user.errors[:nickname].first %></span>
          </div>
        </div>

        <div class="control-group">
          <%= f.label :name, 'Real name', :class => 'control-label' %>
          <div class="controls">
            <%= f.text_field :name, :class => 'text_field' %>
          </div>
        </div>

        <div class="control-group">
          <%= f.label :email, :class => 'control-label' %>
          <div class="controls">
            <%= f.text_field :email, :class => 'text_field' %>
          </div>
        </div>

        <div class="form-actions">
          <%= f.submit 'Create', :class => 'btn btn-primary' %>
        </div>
      </fieldset>
    <% end %>
  </div>
</section>