If you want to add a class before each widget you should use the dynamic_sidebar_params filter. Another post explains this well. Here’s the gist of it.
function uft_add_nocontent_class($params) {
$params[0]['before_widget'] = '<aside id="%1$s" class="widget %2$s nocontent">';
return $params;
}
add_filter('dynamic_sidebar_params', 'uft_add_nocontent_class');
Otherwise, go and edit your child theme files. If you don’t have a lot of sidebars that’s probably the easiest. You could also use some JavaScript to add the class to your selected sidebars.
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