Implements hook_preprocess_maintenance_page().
function bartik_preprocess_maintenance_page(&$variables) {
// By default, site_name is set to Drupal if no db connection is available
// or during site installation. Setting site_name to an empty string makes
// the site and update pages look cleaner.
// @see template_preprocess_maintenance_page
if (!$variables['db_is_active']) {
$variables['site_name'] = '';
}
drupal_add_css(drupal_get_path('theme', 'bartik') . '/css/maintenance-page.css');
}