fix paper size (it was the same as the page size)

assets/css/html2print.less

@@ -32,8 +32,9 @@
         margin: 0;
     }
     .paper {
-        width: @page-width; 
-        height: @page-height;
+        width: @paper-width; 
+        height: @paper-height;
+        box-sizing: border-box;
 
         /* Crop marks */
         padding: @crop;