Youssef Mhamdi

Hello @klecka !

I hope you are doing well today!

I checked your code and it’s looks like you wrote it in a wrong syntax.

Please note that:
'before-widget' & 'after-widget' Must Written with UNDERSCORE (_).
'before_widget' & 'after_widget'

This is the default WP Sidebar registration

<?php $args = array(
	'name'          => __('Sidebar %d'),
        'id'            => 'sidebar',          
	'description'   => '',
	'class'         => '',
	'before_widget' => '<li id="%1$s" class="widget %2$s">',
	'after_widget'  => '</li>',
	'before_title'  => '<h2 class="widgettitle">',
	'after_title'   => '</h2>' ); 
?>

Best Regards,
Youssef