add_action( 'frm_form_classes', 'frm_form_classes' );
function frm_form_classes( $form ) {
  if ( $form->id == 25 ) { //Change 25 to the ID of your form
    echo 'new_class';
  }
}

add_action( 'frm_form_classes', 'frm_form_classes' );
function frm_form_classes( $form ) {
  echo 'new_class';
}

You can use this code example to add a class to your form in some locations on your site but not others. This class can be used to add different styling to the form.

Use the add_class param to set the value of the new class. You can add the add_class param to your form shortcode or set it using frm-set-get.

add_action( 'frm_form_classes', 'frm_add_new_class' );
function frm_add_new_class( $form ) {
	if ( ! isset( $_GET['add_class'] ) ) {
		return;
	}

	$new_class = $_GET['add_class'];
	$new_class = utf8_decode( urldecode( $new_class ) );

	echo esc_html( $new_class );
}

Usage:

• As a param in the form shortcode: Please select a valid form
• Using frm-set-get: [frm-set-get add_class="rose"]
  [formidable id="1245"] Or add a Formidable forms block to display the form. Note: frm-set-get needs to be before the form on the page.