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// Add role class to body
function add_role_to_body($classes) {
	
	global $current_user;
	$user_role = array_shift($current_user->roles);
	
	$classes[] .= 'role-'. $user_role;
	return $classes;
}
add_filter('body_class','add_role_to_body');
add_filter('admin_body_class', 'add_role_to_body');