Text Widget with different Class

I need text widgets in different colors.

I changed the the php-code to register a css class in div before widget. But it don′t work.

function purple_pro_widgets() {

register_sidebar(array(
	'name' => __( 'Sidebar Widget Area', 'purple_pro'),
	'id' => 'sidebar-widget-area',
	'description' => __( 'The sidebar widget area', 'purple_pro'),
	'before_widget' => '<div id="%1$s" class="widget %2$s">',
	'after_widget' => '</div>',
	'before_title' => '<h3>',
	'after_title' => '</h3>',
));
}

the output:

<aside>
<div class="widget"><div><div class="textwidget">

where is the problem.

Thank′s for help