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<?php 
// Force the Page Builder plugin to include 'simple-social-icons' in its widget wrapper class
add_filter( 'siteorigin_panels_widget_classes', 'ssi_add_widget_class' );
function ssi_add_widget_class( $classes ) {
	if ( in_array( 'widget_simple-social-icons', $classes ) ) {
		$classes[] = 'simple-social-icons';
	}

	return $classes;
}