Widgets not adding div on before and after title

I think you missed , at the of after_title that’s why it’s not working. Use this code it’s working fine.

register_sidebar( array(
        'name'          => 'Custom code widget',
        'id'            => 'custom-code',
        'description'   => 'Cutom code for all pages.',
        'before_widget' => '<div class="custom-description">',
        'after_widget'  => '</div>',
        'before_title'  => '<div class="custom-code-title"><h2 class="widget-title">',
        'after_title'   => '</h2></div>',
    ) );