fuel_html_search_form

<form id="nav-bar-search" class="navbar-form navbar-left" role="search" action="/search/" accept-charset="UTF-8">
  <div class="form-group">
    <input type="text" class="form-control" placeholder="Search" name="q">
  </div>
  <button type="submit" class="btn btn-default">Submit</button>
</form>