protected function getNavbarSearchForm($btnColor)
    {
        $action = esc_url(home_url('/'));
        $label = __('Search for', 'novusopress');
        $placeholder = __('Search', 'novusopress');
        $form = <<<EOT

            <form id="navbar-search-form" method="get" action="$action" class="navbar-form navbar-right" role="search">
                <label for="nav_input_search" class="sr-only">$label</label>
                <div class="input-group">
                    <div class="input-group-btn">
                        <button id="nav-searchsubmit" type="submit" class="btn btn-$btnColor">
                            <span class="fa fa-search"></span>
                        </button>
                    </div>
                    <input id="nav_input_search" type="search" class="form-control" name="s" placeholder="$placeholder">
                </div>
            </form><!-- #navbar-search-form -->
EOT;

        return $form;
    }