add a small bottom padding to inner box in header
diff --git a/R/add_header_above.R b/R/add_header_above.R
index 4ca0a33..90d018a 100644
--- a/R/add_header_above.R
+++ b/R/add_header_above.R
@@ -79,7 +79,7 @@
     } else {
       paste0('<th style="text-align:center; border-bottom:hidden; ',
              'padding-bottom:0; padding-left:3px;padding-right:3px;" colspan="',
-             x[2], '"><div style="border-bottom: 1px solid #ddd;">',
+             x[2], '"><div style="border-bottom: 1px solid #ddd;padding-bottom: 5px;">',
              x[1], '</div></th>')
     }
   })