Improve the output of printed pages to pdf

modules/print/print_pdf/print_pdf.pages.inc

@@ -85,6 +85,8 @@ function print_pdf_generate_path($path, $cid = NULL, $pdf_filename = NULL) {
     return;
   }
 
+  $print['body_class'] = 'print-pdf';
+
   // Img elements must be set to absolute
   $pattern = '!<(img\s[^>]*?)>!is';
   $print['content'] = preg_replace_callback($pattern, '_print_rewrite_urls', $print['content']);