__( 'Custom CSS', 'formidable' ), 'hide_title' => false, 'publish' => array( 'FrmStylesHelper::save_button', array() ), 'nav' => FrmStylesHelper::get_style_menu( 'custom_css' ), ) ); ?>

post_content as $k => $v ) { if ( $k === 'custom_css' ) { continue; } ?>