Painless syntax highlighting in Rails

modals.html.erb

<% modal_markup = capture do %>
  <div class="modal">
    <label for="modal-1">
      <div class="btn js-btn">Open Modal</div>
    </label>
    <input class="modal-state" id="modal-1" type="checkbox" />
    <div class="modal-window">
      <div class="modal-inner">
        <label class="modal-close" for="modal-1"></label>
        <h1>Sign In</h1>
        <form>
          <fieldset>
            <p><label for="email">Email</label> <input type="email" id="email" name="email"></p>
            <p><label for="password">Password</label> <input type="password" id="password" name="password"><span><a href="#">Forgot Password?</a></span></p>
            <p><button class"button outline">Sign In</button></p>
          </fieldset>
        </form>
      </div>
    </div>
  </div>
<% end %>

<article class="styleguide-section">
  <a name="modals"></a>
  <h2 class="subheading">Modals</h2>
  <p>Use the modal for displaying non-important information. Use lightly.</p>

  <%= modal_markup %>
  <pre class="prettyprint lang-html"><%= escape_once modal_markup %></pre>
</article>