The Malware Scanner can ignore certain file extensions. Use this filter to change that list.
add_filter( 'securityninja_ignored_file_extensions', 'do_filter_securityninja_ignored_file_extensions' );
function do_filter_securityninja_ignored_file_extensions( $ignore_list ) {
$ignore_list[] = 'css';
return $ignore_list;
}
Add extensions you want skipped, or adjust the list so types you care about are scanned. Broader scans can take longer and may raise more false positives.
Where to add the code: How to include custom code on your website.